The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and
accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION

PRELIMINARY PROSPECTUS SUPPLEMENT DATED JUNE 18, 2018

PROSPECTUS SUPPLEMENT

(to Prospectus dated February 10, 2017)

12,000,000 Shares

Tellurian Inc.

Common Stock

We are selling
12,000,000 shares of our common stock.

Our common stock is listed on the Nasdaq Capital Market under the ticker symbol TELL. On
June 15, 2018, the closing price of our common stock as reported on the Nasdaq Capital Market was $11.07 per share.

Investing in our
common stock involves risks. See Risk Factors beginning on page S-9 of this prospectus supplement and in the documents we incorporate by reference into this prospectus supplement to read about
important facts you should consider before buying our common stock.

The underwriters have agreed to purchase the shares from us at a price of
$ per share, which will result in approximately $ of proceeds to us, before estimated offering expenses. The underwriters propose to offer the
shares from time to time for sale in one or more transactions on the Nasdaq Capital Market, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing
market prices or at negotiated prices. See Underwriting for further details.

The underwriters may also exercise their option to
purchase up to an additional 1,800,000 shares from us, at the price per share set forth above, for 30 days after the date of this prospectus supplement to cover over-allotments.

Neither the Securities and Exchange Commission (the SEC) nor any other regulatory body has approved or disapproved of these securities or
passed upon the accuracy or adequacy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

This prospectus supplement and the accompanying base prospectus are part of a registration statement that we filed with the SEC using a
shelf registration process. We provide information to you about this offering in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering and
(2) the accompanying base prospectus, which provides general information regarding us, our securities, and other information, some of which may not apply to this offering. If information in this prospectus supplement is inconsistent with the
accompanying base prospectus, you should rely on this prospectus supplement. However, if any statement in one of these documents is inconsistent with a statement in a document incorporated by reference in this prospectus supplement having a later
date, the statement in the document having the later date modifies or supersedes the earlier statement as our business, financial condition, results of operations and prospects may have changed since the earlier date.

You should read this prospectus supplement, together with the accompanying base prospectus, the documents incorporated by reference in this
prospectus supplement and the accompanying base prospectus and any free writing prospectus that we have authorized for use in connection with this offering before making an investment decision. You should also read and consider the information in
the documents referred to in the sections of this prospectus supplement and the accompanying base prospectus entitled Where You Can Find More Information and Incorporation of Certain Information by Reference.

We have not authorized anyone to provide you with any information other than that contained or incorporated by reference in this prospectus
supplement, in the accompanying base prospectus or in any free writing prospectus that we have authorized for use in connection with this offering. We and the underwriters take no responsibility for, and can provide no assurance as to the
reliability of, any other information that others may give you.

We are not making an offer to sell nor a solicitation of an offer to buy
our common stock in any jurisdiction in which an offer or solicitation is not permitted or in which the person making the offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation.

The information appearing in this prospectus supplement, the accompanying base prospectus, the documents incorporated by reference in this
prospectus supplement, and in any free writing prospectus that we have authorized for use in connection with this offering is accurate only as of its respective date, regardless of the time of delivery of the respective document or of any sale of
securities covered by this prospectus supplement. You should not assume that the information contained in or incorporated by reference in this prospectus supplement, in the accompanying base prospectus or in any free writing prospectus that we have
authorized for use in connection with this offering, is accurate as of any date other than the respective dates thereof.

Unless otherwise
stated, information in this prospectus supplement assumes that the underwriters will not exercise their option to purchase additional shares of our common stock and that no pre-emptive rights will be exercised to purchase additional shares of our
common stock.

In this prospectus supplement, references to Tellurian, the Company, we, us
or our refer to Tellurian Inc. (which until February 10, 2017 was known as Magellan Petroleum Corporation) and its subsidiaries, unless the context suggests otherwise.

We are subject to the informational reporting requirements of the Securities Exchange Act of 1934, as amended (the Exchange Act),
and we file annual, quarterly, and other reports, proxy statements, and other information with the SEC. You may read and copy any document we file with the SEC at the SECs public reference room at 100 F Street, NE, Washington, D.C. 20549.
Please call the SEC at 1-800-SEC-0330 for more information about the operation of the public reference room. Our SEC filings are also available to the public at the SECs website at http://www.sec.gov. Our website address is
http://www.tellurianinc.com. However, information on our website will not be considered a part of this prospectus supplement.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference the information we file with it,
which means that we can disclose important information to you by referring you to another document that we have filed with the SEC. You should read the information incorporated by reference because it is an important part of this prospectus
supplement. We incorporate by reference the following information or documents that we have filed with the SEC:

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our Annual Report on Form 10-K for the fiscal year ended December 31, 2017 filed with the SEC on March 15, 2018;

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our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018 filed with the SEC on May 9, 2018;

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our Current Reports on Form 8-K filed with the SEC on January 31, 2018, March 21, 2018, April 23, 2018 and June 7, 2018; and

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the description of our common stock contained in the Form 8-K filed with the SEC on June 26, 2013, as the same may be amended from time to time, and as superseded by the disclosures in Description of Our
Capital Stock herein.

All reports and other documents filed by us pursuant to Sections 13(a), 13(c), 14 or 15(d)
of the Exchange Act subsequent to the date of this prospectus supplement and prior to the termination or completion of this offering shall be deemed to be incorporated by reference into this prospectus supplement and the accompanying base prospectus
and shall be a part hereof from the date of filing of such reports and documents.

Any statement contained in a document incorporated or
deemed to be incorporated by reference in this prospectus supplement shall be deemed modified, superseded or replaced for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement, or in any
subsequently filed document that also is deemed to be incorporated by reference in this prospectus supplement, modifies, supersedes or replaces such statement. Any statement so modified, superseded or replaced shall not be deemed, except as so
modified, superseded or replaced, to constitute a part of this prospectus supplement. None of the information that we disclose under Items 2.02 or 7.01 of any Current Report on Form 8-K or any corresponding information, either furnished
under Item 9.01 or included as an exhibit thereto, that we may from time to time furnish to the SEC will be incorporated by reference into, or otherwise included in, this prospectus supplement, except as otherwise expressly set forth in the
relevant document. Subject to the foregoing, all information appearing in this prospectus supplement is qualified in its entirety by the information appearing in the documents incorporated by reference.

We will furnish to you, upon written or oral request, a copy of any or all of the documents that
have been incorporated by reference, including exhibits to those documents. You may request a copy of those filings at no cost by writing or telephoning our corporate secretary at the following address and telephone number:

Tellurian Inc.

Attention: Corporate Secretary

1201 Louisiana Street, Suite 3100

Houston, Texas 77002

Telephone
No.: (832) 962-4000

Except as provided above, no other information, including information on our website, is incorporated by
reference in this prospectus supplement.

The information in this prospectus supplement, including information in documents incorporated by reference in this prospectus supplement,
includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the Securities Act), and Section 21E of the Exchange Act. All statements, other than statements of
historical facts, that address activities, events, or developments with respect to our consolidated financial condition, results of operations or economic performance that we expect, believe, or anticipate will or may occur in the future, or that
address plans and objectives of management for future operations, are forward-looking statements. The words anticipate, assume, believe, budget, estimate, expect,
forecast, intend, plan, project, will, and similar expressions are intended to identify forward-looking statements. These forward-looking statements relate to, among other things:

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our businesses and prospects;



planned or estimated capital expenditures;



availability of liquidity and capital resources;



our ability to obtain additional financing as needed;



revenues and expenses;



progress in developing our projects and the timing of that progress;



future values of our projects or other interests, operations or rights that Tellurian holds; and



government regulations, including our ability to obtain, and the timing of, necessary governmental permits and approvals.

Our forward-looking statements are based on assumptions and analyses made by us in light of our experience and our perception of historical
trends, current conditions, expected future developments, and other factors that we believe are appropriate under the circumstances. These statements are subject to a number of known and unknown risks and uncertainties, which may cause our actual
results and performance to be materially different from any future results or performance expressed or implied by the forward-looking statements. These risks and uncertainties are described in the Risk Factors sections of this prospectus
supplement and our filings with the SEC incorporated by reference in this prospectus supplement and include such factors as:

The forward-looking statements in
this prospectus supplement speak as of the date hereof. Although we may from time to time voluntarily update our prior forward-looking statements, we disclaim any commitment to do so except as required by securities laws.

This summary highlights certain information contained elsewhere in this prospectus supplement, the accompanying base prospectus and in the
documents we incorporate by reference. This summary is not complete and does not contain all of the information that you should consider before investing in our securities. You should read this entire prospectus supplement, the accompanying base
prospectus and any related free writing prospectus carefully, including the information referred to in the section entitled Risk Factors beginning on page S-9 of this prospectus supplement, as well as the other documents that we
incorporate by reference into this prospectus supplement and the accompanying base prospectus, including our financial statements and the exhibits to the registration statement of which this prospectus supplement and the accompanying base prospectus
is a part.

Our Business

We
intend to create value for shareholders by building a low-cost, global natural gas business, profitably delivering natural gas to customers worldwide (the Business). We are developing a portfolio of natural gas production, LNG marketing,
and infrastructure assets that includes an LNG terminal facility (the Driftwood terminal) and an associated pipeline (the Driftwood pipeline) in southwest Louisiana (the Driftwood terminal and the Driftwood pipeline
collectively, the Driftwood Project). Our Business may be developed in phases.

The proposed Driftwood terminal will have a
liquefaction capacity of approximately 27.6 million tonnes per annum and will be situated on approximately 1,000 acres in Calcasieu Parish, Louisiana. The proposed terminal will include up to 20 liquefaction trains, three full containment LNG
storage tanks and three marine berths. We have entered into four lump sum turnkey engineering, procurement and construction agreements totaling $15.2 billion with Bechtel Oil, Gas and Chemicals, Inc. (Bechtel) for construction of
the Driftwood terminal.

The proposed Driftwood pipeline is a new 96-mile large diameter pipeline that will interconnect with 14 existing
interstate pipelines throughout southwest Louisiana to secure adequate natural gas feedstock for the Driftwood terminal. The Driftwood pipeline will be comprised of 48-inch, 42-inch, 36-inch and 30-inch diameter pipeline segments and three
compressor stations totaling approximately 274,000 horsepower, all as necessary to provide approximately 4 Bcf/d of average daily natural gas transportation service. We estimate construction costs for the Driftwood pipeline of approximately
$2.3 billion before owners costs, financing costs and contingencies.

We intend to develop the Driftwood pipeline as part of
what we refer to as the Pipeline Network. In addition to the Driftwood pipeline, the Pipeline Network is expected to include two pipelines which are currently in the early stages of development. One, the Haynesville Global Access
Pipeline, is expected to run 200 miles from northern to southwest Louisiana. The other, the Permian Global Access Pipeline, is expected to run 625 miles from west Texas to southwest Louisiana. Each is expected to have a diameter of 42 inches and be
capable of delivering approximately 2 Bcf/d of natural gas. We currently estimate that construction costs will be approximately $1.4 billion for the Haynesville Global Access Pipeline and approximately $3.7 billion for the Permian Global Access
Pipeline, in each case before owners costs, financing costs and contingencies.

Our upstream properties, acquired in a series of
transactions during 2017 and 2018, consist of 11,620 net acres and 20 operated producing wells located in the Haynesville Shale trend of north Louisiana. These wells have net current production of approximately 3.6 MMcf/d. As of December 31,
2017, our estimate of net reserves in these properties was 327,180 MMcfe. We are pursuing opportunities to acquire additional upstream assets in the Haynesville and are discussing certain potential financing transactions for our upstream activities.
We also continue to develop our LNG marketing activities.

In connection with the implementation of our Business, we are offering partnership interests
in a subsidiary, Driftwood Holdings LLC (Driftwood Holdings), which will own the Driftwood terminal, one or more of our pipelines, and our natural gas production assets. Partners will contribute cash in exchange for interests in
Driftwood Holdings pursuant to which they will receive LNG volumes at the cost of production for the life of the Driftwood terminal. We plan to retain a portion of the ownership in Driftwood Holdings.

Our Company

The Company was founded in
1957 and incorporated in Delaware in 1967 as Magellan Petroleum Corporation. We changed our corporate name to Tellurian Inc. shortly after completing a merger transaction with Tellurian Investments Inc., a Delaware corporation (Tellurian
Investments), in February 2017. Our common stock has been trading on the Nasdaq Stock Market since 1972. It currently trades under the ticker symbol TELL.

Our principal executive offices are located at 1201 Louisiana Street, Suite 3100, Houston, Texas 77002, and our telephone number is
(832) 962-4000. We maintain a website at http://www.tellurianinc.com. The information contained in, or that can be accessed through, our website is not part of this prospectus supplement.

The following summary contains basic information about our common stock and the offering and is not intended to be complete. It does not
contain all the information that may be important to you. See Underwriting in this prospectus supplement for a more detailed description of the terms and conditions of the underwriting agreement and the offering. For a more detailed
description of our common stock, see Description of Our Capital Stock in this prospectus supplement.

The underwriters have an option to purchase a maximum of 1,800,000 additional shares. The option may be exercised within 30 days after the date of this prospectus supplement.

Nasdaq Capital Market ticker symbol

TELL

Use of proceeds

We estimate that our net proceeds from this offering, after deducting estimated fees and expenses, will be approximately $ ($ if the
underwriters exercise their option to purchase 1,800,000 additional shares of our common stock in full).

We intend to use the net proceeds from this offering for general corporate purposes, including pipeline development and working capital. See Use of Proceeds on page S-11 of this prospectus supplement.

Risk factors

Investing in our common stock involves a high degree of risk. Please see Risk Factors on page S-9 of this prospectus supplement and the other information included or incorporated by reference in this prospectus
supplement or the accompanying base prospectus for a discussion of factors you should carefully consider before investing in our common stock.

On May 10, 2017, Tellurian and TOTAL Delaware, Inc. (TOTAL) entered into a pre-emptive rights
agreement pursuant to which TOTAL was granted a right to purchase its pro rata portion of any new equity securities that Tellurian may issue to a third party on the same terms and conditions as such equity securities are offered and sold to such
party, subject to certain excepted offerings. As a result, TOTAL will be entitled to purchase approximately 2,875,084 shares of our common stock at the public offering price in connection with this offering (or approximately 3,306,346 shares if the
underwriters exercise their option to purchase additional shares in full). The information above regarding the number of shares of our common stock outstanding (i) assumes that no pre-emptive rights will be exercised by TOTAL to purchase
additional shares and (ii) is based on 228,522,514 shares of common stock outstanding as of June 15, 2018. The number of shares of our common stock outstanding as of that date does not include shares that may be issuable under our
equity compensation plan or 6,123,782 shares issuable upon the conversion of our outstanding Series C convertible preferred stock.

Investing in our securities involves a high degree of risk. You should carefully consider the risks set forth in the Risk
Factors sections of the documents that we incorporate by reference into this prospectus supplement and the accompanying base prospectus. If any of the events described in such Risk Factors disclosures occurs or such risks otherwise
materialize, our business, financial condition, results of operations, cash flows, or prospects could be materially adversely affected.

Resales
of our common stock in the public market following this offering may cause the trading price to fall.

Resales of a substantial
number of shares of our common stock could depress the trading price of our common stock. This offering of new shares of our common stock could result in resales of our common stock by our current stockholders concerned about the potential dilution
of their holdings. If our stockholders sell substantial amounts of our common stock in the public market following the offering contemplated by this prospectus supplement, the trading price of our common stock could fall.

If you purchase our common stock in the public market following this offering, you will experience immediate dilution as a result of future equity
issuances.

Because the price per share of our common stock being offered may be higher than the book value per share of our common
stock, you may suffer immediate and substantial dilution in the net tangible book value of the common stock you purchase in this offering. The issuance of additional shares of our common stock in future offerings could be dilutive to stockholders if
they do not invest in future offerings. Moreover, to the extent that we issue options or warrants to purchase, or securities convertible into or exchangeable for, shares of our common stock in the future and those options, warrants or other
securities are exercised, converted or exchanged, stockholders may experience further dilution.

We have broad discretion in the use of the net
proceeds of the offering of our common stock contemplated by this prospectus supplement and, despite our efforts, we may use the proceeds in a manner that does not improve our operating results or increase the value of your investment.

We currently anticipate that the net proceeds from the offering of our common stock contemplated by this prospectus supplement will be used as
described in Use of Proceeds. However, we have not determined the specific use of the net proceeds from the offering of our common stock contemplated by this prospectus supplement. Our management will have broad discretion over the use
and investment of those funds, and, accordingly, investors will need to rely upon the judgment of our management with respect to the use of proceeds, with only limited information concerning our specific intentions. These proceeds could be applied
in ways that do not improve our operating results or increase the value of your investment.

Non-U.S. holders of our common stock, in certain
situations, could be subject to U.S. federal income tax upon sale, exchange or disposition of our common stock.

It is likely that
we are, and will remain for the foreseeable future, a U.S. real property holding corporation for U.S. federal income tax purposes because our assets consist primarily of United States real property interests as defined in the Internal
Revenue Code of 1986, as amended (the Code), and applicable Treasury regulations. As a result, under the Foreign Investment in Real Property Tax Act, or FIRPTA, certain non-U.S. investors may be subject to U.S. federal income tax on any
gain from the disposition of shares of our common stock, in which case they would also be required to file U.S. tax returns with respect to such gain. In general, whether these FIRPTA provisions apply depends on the amount of our common stock that
such non-U.S. investors hold. In addition, such non-U.S. investors may

be subject to withholding if, at the time they dispose of their shares, our common stock is not regularly traded on an established securities market within the meaning of the applicable Treasury
regulations. So long as our common stock continues to be regularly traded on an established securities market, only a non-U.S. investor who has owned, actually or constructively, more than 5% of our common stock at any time during the shorter of
(i) the five-year period ending on the date of disposition and (ii) the non-U.S. investors holding period for its shares may be subject to U.S. federal income tax on the disposition of our common stock under FIRPTA. See
Material United States Federal Income Tax Considerations to Non-U.S. Holders.

We estimate that our net proceeds from this offering, after deducting estimated fees and expenses, will be approximately
$ (or $ if the underwriters exercise their option to purchase 1,800,000 additional shares of our common stock in full).

The net proceeds will be used for general corporate purposes, including pipeline development and working capital. Pending the application of
the net proceeds from this offering, we intend to invest such proceeds in short- and intermediate-term interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government.

We will bear all of the expenses of this offering, and such expenses will be paid out of our general funds.

The following table sets forth our capitalization and cash position as of March 31, 2018 on:



an actual basis; and



an as-adjusted basis to give effect to the issuance and sale of 12,000,000 shares of our common stock in this offering, assuming no exercise of the underwriters option to purchase additional shares and
assuming the net proceeds are initially held as cash and cash equivalents, pending their use as described in Use of Proceeds.

This table should be read in conjunction with, and is qualified in its entirety by reference to, our financial statements and the accompanying
notes, incorporated by reference into this prospectus supplement and the accompanying prospectus and Use of Proceeds in this prospectus supplement.

The following summary is a description of the material U.S. federal income tax consequences relating to the purchase, ownership and
disposition of our common stock by non-U.S. holders (as defined below). The discussion is for general information only and does not consider all aspects of U.S. federal income taxation that may be relevant to the purchase, ownership and disposition
of our common stock by a non-U.S. holder in light of its personal circumstances. In particular, this discussion does not address the U.S. federal income tax consequences of ownership of our common stock by investors that do not hold the stock as a
capital asset within the meaning of Section 1221 of the Code, or the U.S. federal income tax consequences to beneficial owners subject to special treatment under the U.S. federal income tax laws, such as:

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dealers in securities or currencies;

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certain electing traders in securities;

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persons holding our common stock as part of a conversion, constructive sale, wash sale or other integrated transaction or a straddle or synthetic security;

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persons subject to the alternative minimum tax;

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certain former citizens or long-term residents of the United States;

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foreign governments or international organizations;

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banks or other financial institutions;

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controlled foreign corporations and passive foreign investment companies, each as defined for U.S. federal income tax purposes, and shareholders of such entities;

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insurance companies;

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entities that are tax-exempt for U.S. federal income tax purposes and retirement plans, individual retirement accounts and tax-deferred accounts; and

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pass-through entities, including partnerships and entities and arrangements classified as partnerships for U.S. federal tax purposes, and beneficial owners of pass-through entities.

Non-U.S. holders subject to the special circumstances described above may be subject to tax rules that differ significantly from those
summarized below. In addition, this summary does not include any non-U.S. tax laws or state or local tax laws that may be applicable to a particular investor and does not consider any aspects of U.S. federal estate or gift tax law.

You are a non-U.S. holder of our common stock if you are a beneficial owner of the stock and are not, for U.S. federal income tax
purposes:

a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) organized or created in or under the laws of the United States, any state thereof or the District of Columbia;

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an estate, the income of which is subject to U.S. federal income tax regardless of the source of such income; or

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a trust (i) if a court within the U.S. is able to exercise primary supervision over its administration and one or more U.S. persons have the authority to control all of the substantial decisions of the trust, or
(ii) that has a valid election in place to be treated as a U.S. person for U.S. federal income tax purposes.

If an
entity treated as a partnership for U.S. federal income tax purposes holds our common stock, the tax consequences of such partnership and the partners in such partnership generally will depend on the status of each of the partners and the activities
of the partnership. Partners of partnerships considering the purchase of our common stock are encouraged to consult with their independent tax advisors.

This summary is based upon the Code, existing and proposed Treasury regulations promulgated thereunder, administrative pronouncements and
judicial decisions, all in effect as of the date hereof, all of which are subject to change, possibly on a retroactive basis. Such a change could affect the continuing validity of this discussion and may adversely affect a non-U.S. holder. There can
be no assurance that the Internal Revenue Service, or the IRS, will not challenge one or more of the conclusions described herein, and we have not obtained, and do not intend to obtain, a ruling from the IRS with respect to the U.S. federal income
tax consequences of purchasing, owning and disposing of our common stock.

IF YOU ARE CONSIDERING THE PURCHASE OF OUR COMMON STOCK, YOU
ARE ENCOURAGED TO CONSULT WITH AN INDEPENDENT TAX ADVISOR REGARDING THE APPLICATION OF U.S. FEDERAL INCOME AND ESTATE TAX LAWS, AS WELL AS OTHER U.S. FEDERAL TAX LAWS AND THE LAWS OF ANY STATE, LOCAL OR NON-U.S. TAXING JURISDICTION, TO YOUR
PARTICULAR SITUATION. THIS DISCUSSION OF U.S. FEDERAL TAX CONSIDERATIONS IS FOR GENERAL INFORMATION ONLY AND IS NOT TAX ADVICE.

Dividend
Distributions

Any distributions with respect to the shares of our common stock, to the extent paid out of our current or accumulated
earnings and profits (as determined under U.S. federal income tax principles), will constitute dividends for U.S. federal income tax purposes and will be subject to U.S. federal withholding tax at a 30% rate or such lower rate as specified by an
applicable income tax treaty, provided that such dividends are not effectively connected with the non-U.S. holders conduct of a U.S. trade or business (and, if required by an applicable income tax treaty, are attributable to a U.S.
permanent establishment maintained by such non-U.S. holder). Distributions in excess of our current and accumulated earnings and profits (as determined under U.S. federal income tax principles) will first constitute a return of capital
that is applied against and reduces the non-U.S. holders adjusted tax basis in our common stock (determined on a share by share basis), and, to the extent such distribution exceeds the non-U.S. holders adjusted tax basis, the excess will
be treated as gain realized on the sale or other disposition of our common stock as described below under Sale, Exchange or Other Taxable Disposition of Stock.

Under the terms of an applicable U.S. income tax treaty (if any), the withholding tax might not apply, or might apply at a reduced rate. A
non-U.S. holder who wishes to claim the benefit of an applicable income tax treaty is required to satisfy applicable certification and disclosure requirements

(generally by providing our paying agent or a relevant withholding agent with an IRS Form W-8BEN or IRS Form W-8BEN-E). If a non-U.S. holder is eligible for a reduced rate of U.S.
withholding tax pursuant to an income tax treaty, such non-U.S. holder may obtain a refund or credit of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS.

Dividends that are effectively connected with the conduct of a non-U.S. holders trade or business within the United States (and, if
required by an applicable income tax treaty, are attributable to a U.S. permanent establishment maintained by such non-U.S. holder) are not subject to U.S. federal withholding tax if such non-U.S. holder provides our paying agent or a
relevant withholding agent with an IRS Form W-8ECI, but generally will be subject to U.S. federal income tax on a net-income basis at applicable graduated individual or corporate rates, unless an applicable income tax treaty provides otherwise.
A foreign corporation may be subject to an additional branch profits tax (at a 30% rate or such lower rate as specified by an applicable income tax treaty) on its effectively connected earnings and profits attributable to such income.

Sale, Exchange or Other Taxable Disposition of Stock

Subject to the discussions below under Information Reporting and Backup Withholding and Foreign Accounts, any gain
realized by a non-U.S. holder upon the sale, exchange or other taxable disposition of shares of our common stock generally will not be subject to U.S. federal income tax unless:

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that gain is effectively connected with the non-U.S. holders conduct of a trade or business in the United States (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent
establishment maintained by the non-U.S. holder);

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the non-U.S. holder is an individual who is present in the United States for 183 days or more in the taxable year of that disposition, and certain other conditions are met; or

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we are or have been a United States real property holding corporation (a USRPHC) for U.S. federal income tax purposes at any time during the shorter of (i) the five-year period ending on the date of
disposition, and (ii) the non-U.S. holders holding period for its shares of our common stock and, if shares of our common stock are regularly traded on an established securities market, the non-U.S. holder held, directly or
indirectly, at any time during such period, more than 5% of our issued and outstanding common stock.

Gain described in the
first bullet point above will be subject to U.S. federal income tax in the same manner as that of a U.S. person, unless an applicable income tax treaty provides otherwise. If such non-U.S. holder is a foreign corporation, such gain may also be
subject to a branch profits tax (at a 30% rate or such lower rate as specified by an applicable income tax treaty) on its effectively connected earnings and profits attributable to such income. A non-U.S. holder described in the second bullet point
above will be subject to a 30% U.S. federal income tax on the gain derived from the sale, which may be offset by certain U.S.-source capital losses.

It is likely that we are currently a USRPHC for U.S. federal income tax purposes and it is likely that we will remain one in the future.
However, so long as our common stock continues to be regularly traded on an established securities market within the meaning of the applicable Treasury regulations, only a non-U.S. holder who holds or held more than 5% of our common stock at any
time during the shorter of (i) its holding period and (ii) the five-year period preceding the date of disposition (a greater-than-five-percent shareholder) will be subject to U.S. federal income tax on the disposition of our
common stock. A greater-than-five-percent shareholder generally will be subject to U.S. federal income tax on the net gain derived from the sale in the same manner as a U.S. person, unless an applicable income tax treaty

provides otherwise. Such a non-U.S. holder generally will be required to file a U.S. federal income tax return in respect of such gain. No withholding is required upon any sale or other taxable
disposition of our common stock if it is regularly traded on an established securities market. If we are a USRPHC and our common stock ceases to be regularly traded on an established securities market, a non-U.S. holder will be subject to tax on any
gain recognized on the sale or other taxable disposition of our common stock, and withholding, generally at a rate of 15%, on the gross proceeds thereof, regardless of such non-U.S. holders percentage ownership of our common stock.

Information Reporting and Backup Withholding

We and other withholding agents must report annually to the IRS the amount of dividends or other distributions paid to non-U.S. holders on
shares of our common stock and the amount of tax we and other withholding agents withhold on these distributions. Copies of the information returns reporting such distributions and any withholding may also be made available to the tax authorities in
the country in which the non-U.S. holder resides, under the provisions of an applicable income tax treaty.

A non-U.S. holder will not be
subject to backup withholding (the current rate of which is 24%) on reportable payments the non-U.S. holder receives on shares of our common stock if the non-U.S. holder provides proper certification (usually
on an IRS Form W-8BEN or IRS Form W-8BEN-E) of its status as a non-U.S. person.

Information reporting and backup withholding generally are not required with respect to the amount of any proceeds from the sale or other
disposition of shares of our common stock outside the United States through a foreign office of a foreign broker that does not have certain specified connections to the United States. However, information reporting will apply if a non-U.S. holder
sells shares of our common stock outside the United States through a U.S. broker or a broker that is a controlled foreign corporation, a foreign person that derives 50% or more of its gross income for certain periods from the conduct of a trade or
business in the United States, or a foreign partnership that, at any time during its tax year, either is engaged in the conduct of a trade or business in the United States or has as partners one or more U.S. persons that, in the aggregate, hold more
than 50% of the income or capital interests in the partnership. If a sale or other disposition is made through a U.S. office of any broker, the broker will be required to report the amount of proceeds paid to the non-U.S. holder to the IRS and to
backup withhold on that amount unless the non-U.S. holder provides appropriate certification (usually on an IRS Form W-8BEN or IRS Form W-8BEN-E) to the broker certifying the non-U.S. holders status as a non-U.S. person or other
exempt status.

Any amounts withheld under the backup withholding rules will generally be allowed as a refund or a credit against a
non-U.S. holders U.S. federal income tax liability, provided the required information is properly furnished to the IRS on a timely basis.

Foreign Accounts

Sections 1471
through 1474 of the Code (commonly referred to as FATCA) generally impose a 30% withholding tax on withholdable payments, which include dividends on our common stock and gross proceeds from the disposition of our common stock
paid to (i) a foreign financial institution (as defined in Section 1471 of the Code) unless it agrees to collect and disclose to the IRS information regarding direct and indirect U.S. account holders and (ii) a non-financial foreign
entity unless it certifies certain information regarding substantial U.S. owners of the entity, which generally includes any U.S. person who directly or indirectly owns more than 10% of the entity. Foreign financial institutions located in
jurisdictions that have an intergovernmental agreement with the United States governing FATCA may be subject to different rules. Under U.S. Treasury regulations and IRS guidance, the withholding

obligations described above apply to payments of dividends on our common stock, and will apply to payments of gross proceeds from a sale or other disposition of our common stock on or after
January 1, 2019. Prospective non-U.S. holders should consult their own tax advisors with respect to the potential tax consequences of FATCA.

Under the terms and subject to the conditions contained in an underwriting agreement dated the date of this prospectus supplement, we have
agreed to sell to the underwriters named below, for whom Credit Suisse Securities (USA) LLC is acting as representative, the following number of shares of our common stock:

Underwriter

Number of Shares

Credit Suisse Securities (USA) LLC

Total

12,000,000

The underwriters are committed to take and pay for all of the shares being offered, if any are taken, other
than the shares covered by the option described below unless and until this option is exercised.

We estimate that the total expenses of
this offering, including registration, filing and listing fees, printing fees and legal and accounting expenses will be approximately $100,000.

The underwriters have an option to buy up to an additional 1,800,000 shares from us to cover sales by the underwriters of a greater
number of shares than the total number set forth in the table above. They may exercise that option for 30 days to cover over-allotments. If any shares are purchased pursuant to this option, the underwriters will severally purchase shares in
approximately the same proportion as set forth in the table above.

The underwriters may offer the shares from time to time for sale in
one or more transactions on the Nasdaq Capital Market, in the over-the-counter market, through negotiated transactions or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or at negotiated
prices, subject to receipt and acceptance by them and subject to their right to reject any order in whole or in part. In connection with the sale of the shares offered hereby, the underwriters may be deemed to have received compensation in the form
of underwriting discounts. The underwriters may effect such transactions by selling shares to or through dealers, and such dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or purchasers
of shares for whom they may act as agents or to whom they may sell as principal. The difference between the price at which an underwriter purchases shares and the price at which such underwriter resells such shares may be deemed underwriting
compensation.

We have agreed that we will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, or
file with the SEC a registration statement under the Securities Act relating to, any shares of our common stock or securities convertible into or exchangeable or exercisable for any shares of our common stock, or publicly disclose the intention to
make any offer, sale, pledge, disposition or filing, without the prior written consent of Credit Suisse Securities (USA) LLC for a period of 60 days after the date of this prospectus supplement. The foregoing restrictions will not apply to
(i) any securities issued or to be issued pursuant to our equity incentive or award plans in effect on the date hereof, including any shares of our common stock issued or to be issued upon the exercise or vesting thereof; (ii) the offer
and sale of the shares to be sold in connection with this prospectus supplement; (iii) any securities issued or to be issued pursuant to our existing at the market program; (iv) any shares of our common stock issued upon the
conversion of any shares of Series C convertible preferred stock that are outstanding on the date hereof; or (v) any shares of our common stock issued or to be issued to TOTAL in connection with preemptive rights held by TOTAL (it being
understood that any such shares of our common stock issued or to be issued to TOTAL will not be sold pursuant to this offering). The lock-up period will commence on the date hereof and continue for 60 days after the date hereof or such earlier
date that Credit Suisse Securities (USA) LLC consents to in writing.

Our executive officers and directors have agreed that they will not offer, sell, contract to
sell, pledge or otherwise dispose of, directly or indirectly, any shares of our common stock or securities convertible into or exchangeable or exercisable for any shares of our common stock, enter into a transaction that would have the same effect,
or enter into any swap, hedge or other arrangement that transfers, in whole or in part, any of the economic consequences of ownership of our common stock, whether any of these transactions are to be settled by delivery of our common stock or other
securities, in cash or otherwise, or publicly disclose the intention to make any offer, sale, pledge or disposition, or to enter into any transaction, swap, hedge or other arrangement with similar effect, without, in each case, the prior written
consent of Credit Suisse Securities (USA) LLC for a period of 60 days after the date of this prospectus supplement, provided that each of our executive officers and directors, may, without the written consent of Credit Suisse Securities (USA)
LLC, (i) effect the cashless exercise or net share settlement of options to acquire shares of our common stock or other awards granted pursuant to an equity incentive plan in effect on the date hereof, it being understood that any shares of our
common stock received by such person upon such exercise shall be subject to a lock-up agreement, and provided that, if such person reports any such transfer or other disposition on a Form 4 filed with the SEC pursuant to Section 16 of the
Exchange Act in reliance on this clause (i), then such Form 4 shall include a statement to the effect that such transfer or other disposition was made solely to effect the cashless exercise or net share settlement of options to acquire
shares of our common stock or other awards granted pursuant to an equity incentive plan, (ii) transfer to us any shares of our common stock or have us withhold any shares of our common stock from issuance for purposes of satisfying any tax
withholding obligation that arises in connection with the vesting of such awards, provided that, if such person reports any such transfer or other disposition on a Form 4 filed with the SEC pursuant to Section 16 of the Exchange Act in
reliance on this clause (ii), then such Form 4 shall include a statement to the effect that such transfer or other disposition was made to us solely to permit such person to satisfy the tax withholding obligation that arises in connection
with the vesting of an award granted under one of our company equity incentive plans, (iii) transfer shares of our common stock under a trading plan pursuant to Rule 10b5-1 under the Exchange Act that was in effect prior to the date of the
underwriting agreement (not including any amendment thereto after the date of the underwriting agreement) and (iv) establish a trading plan pursuant to Rule 10b5-1 under the Exchange Act for the transfer of shares of our common stock,
provided that such plan does not provide for any transfers of shares of our common stock during the lock-up period and provided further that no filing with the SEC or other public announcement shall be required or voluntarily made by the such person
or any other person in connection therewith.

We have agreed to indemnify the underwriters against liabilities under the Securities Act,
or contribute to payments that the underwriters may be required to make in that respect.

The shares of common stock are listed on the
Nasdaq Capital Market under the ticker symbol TELL.

The underwriters and their affiliates are full-service financial
institutions engaged in various activities, which may include sales and trading, commercial and investment banking, advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financial and
non-financial activities and services. The underwriters and their affiliates have provided, and may in the future provide, a variety of these services to us and to persons and entities with relationships with us, for which they received or will
receive customary fees and expenses.

In the ordinary course of their various business activities, the underwriters and their
affiliates, officers, directors and employees may purchase, sell or hold a broad array of investments and actively traded securities, derivatives, loans, commodities, currencies, credit default swaps and other financial instruments for their own
account and for the accounts of their customers, and such investment and trading activities may involve or relate to our assets, securities and/or instruments (directly, as collateral securing other obligations or otherwise) and/or persons and
entities with relationships with us. The underwriters and their affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such assets,
securities or instruments and may at any time hold, or recommend to clients that they should acquire, long and/or short positions in such assets, securities and instruments.

In connection with the offering, the underwriters may engage in stabilizing transactions, over-allotment transactions, syndicate covering
transactions and penalty bids in accordance with Regulation M under the Exchange Act.



Stabilizing transactions permit bids to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum.



An over-allotment involves sales by the underwriters of shares in excess of the number of shares the underwriters are obligated to purchase, which creates a syndicate short position. The short position may be either a
covered short position or a naked short position. In a covered short position, the number of shares over-allotted by the underwriters is not greater than the number of additional shares that they have the option to purchase. In a naked short
position, the number of shares involved is greater than the number of additional shares that they have the option to purchase. The underwriters may close out any covered short position by either exercising their option to purchase additional shares
and/or purchasing shares in the open market.



Syndicate covering transactions involve purchases of the common stock in the open market after the distribution has been completed in order to cover syndicate short positions. In determining the source of shares to
close out the short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase additional shares through their option to purchase
such shares. If the underwriters sell more shares than could be covered by their option to purchase additional shares, a naked short position, the position can only be closed out by buying shares in the open market. A naked short position is more
likely to be created if the underwriters are concerned that there could be downward pressure on the price of the shares in the open market after pricing that could adversely affect investors who purchase shares in the offering.



Penalty bids permit the representative to reclaim a selling concession from a syndicate member when the common stock originally sold by the syndicate member is purchased in stabilizing or syndicate covering transaction
to cover syndicate short positions.

These stabilizing transactions, syndicate covering transactions and penalty bids may have the effect of
raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of the common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open
market. These transactions may be effected on the Nasdaq Capital Market or otherwise and, if commenced, may be discontinued at any time.

A prospectus in electronic format may be made available on the websites maintained by one or more
of the underwriters, or selling group members, if any, participating in this offering, and one or more of the underwriters participating in this offering may distribute prospectuses electronically. The underwriters may agree to allocate a number of
shares to underwriters and selling group members for sale to their online brokerage account holders. Internet distributions will be allocated by the underwriters and selling group members that will make internet distributions on the same basis as
other allocations.

Selling Restrictions

General

Other than in the United
States, no action has been taken by us or the underwriters that would permit a public offering of the common stock offered by this prospectus supplement in any jurisdiction where action for that purpose is required. The common stock offered by this
prospectus supplement may not be offered or sold, directly or indirectly, nor may this prospectus supplement or any other offering material or advertisements in connection with the offer and sale of any such securities be distributed or published in
any jurisdiction, except under circumstances that will result in compliance with the applicable rules and regulations of that jurisdiction. Persons into whose possession this prospectus supplement comes are advised to inform themselves about and to
observe any restrictions relating to the offering and the distribution of this prospectus supplement. This prospectus supplement does not constitute an offer to sell or a solicitation of an offer to buy any securities offered by this prospectus
supplement in any jurisdiction in which such an offer or a solicitation is unlawful.

Notice to Prospective Investors in Canada

The common stock may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined
in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing
Registrant Obligations. Any resale of the common stock must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this
prospectus supplement and the accompanying prospectus (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the
securities legislation of the purchasers province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchasers province or territory for particulars of these rights or consult with
a legal advisor.

Pursuant to section 3A.3 of National Instrument 33-105 Underwriting Conflicts (NI 33-105),
the underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Notice to Prospective Investors in the European Economic Area

In relation to each member state of the European Economic Area (Member State), no offer of common stock which is the subject of the
offering has been, or will be made to the public in that Member State, other than under the following exemptions under the Prospectus Directive:

(a)

to any legal entity which is a qualified investor as defined in the Prospectus Directive;

to fewer than 150 natural or legal persons (other than qualified investors as defined in the Prospectus Directive), subject to obtaining the prior consent of the representative for any such offer; or

(c)

in any other circumstances falling within Article 3(2) of the Prospectus Directive,

provided that no
such offer of common stock referred to in (a) to (c) above shall result in a requirement for the Company or the representative to publish a prospectus pursuant to Article 3 of the Prospectus Directive, or supplement a prospectus
pursuant to Article 16 of the Prospectus Directive.

Each person located in a Member State to whom any offer of common stock is made
or who receives any communication in respect of an offer of common stock, or who initially acquires any common stock will be deemed to have represented, warranted, acknowledged and agreed to and with the representative and the Company that
(1) it is a qualified investor within the meaning of the law in that Member State implementing Article 2(1)(e) of the Prospectus Directive; and (2) in the case of any common stock acquired by it as a financial intermediary
as that term is used in Article 3(2) of the Prospectus Directive, the common stock acquired by it in the offer has not been acquired on behalf of, nor has it been acquired with a view to its offer or resale to, persons in any Member State other
than qualified investors, as that term is defined in the Prospectus Directive, or in circumstances in which the prior consent of the representative has been given to the offer or resale; or where common stock has been acquired by it on behalf of
persons in any Member State other than qualified investors, the offer of that common stock to it is not treated under the Prospectus Directive as having been made to such persons.

The Company, the underwriters and their respective affiliates will rely upon the truth and accuracy of the foregoing representations,
acknowledgments and agreements.

This prospectus supplement has been prepared on the basis that any offer of shares in any Member State
will be made pursuant to an exemption under the Prospectus Directive from the requirement to publish a prospectus for offers of shares. Accordingly, any person making or intending to make an offer in that Member State of shares which are the subject
of the offering contemplated in this prospectus supplement may only do so in circumstances in which no obligation arises for the Company or the underwriters to publish a prospectus pursuant to Article 3 of the Prospectus Directive in relation
to such offer. Neither the Company nor the underwriters have authorized, nor do they authorize, the making of any offer of shares in circumstances in which an obligation arises for the Company or the underwriters to publish a prospectus for such
offer.

For the purposes of this provision, the expression an offer of common stock to the public in relation to any common
stock in any Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the common stock to be offered so as to enable an investor to decide to purchase or subscribe the common stock, as
the same may be varied in that Member State by any measure implementing the Prospectus Directive in that Member State, and the expression Prospectus Directive means Directive 2003/71/EC (as amended) and includes any
relevant implementing measure in each Member State.

The above selling restriction is in addition to any other selling restrictions set
out below or above.

Notice to Prospective Investors in the United Kingdom

In the United Kingdom, this document is being distributed only to, and is directed only at, and any offer subsequently made may only be
directed at persons who are qualified investors (as defined in the Prospectus Directive) (i) who have professional experience in matters relating to investments

falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the Order) and/or (ii) who are high net worth
companies (or persons to whom it may otherwise be lawfully communicated) falling within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as relevant persons). This document must not be acted on
or relied on in the United Kingdom by persons who are not relevant persons. In the United Kingdom, any investment or investment activity to which this document relates is only available to, and will be engaged in with, relevant persons.

Notice to Prospective Investors in Switzerland

The shares may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (SIX) or on any other stock
exchange or regulated trading facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure
standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other offering or marketing material
relating to the shares or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this
document nor any other offering or marketing material relating to the offering, the Company, or the shares have been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the
offer of shares will not be supervised by, the Swiss Financial Market Supervisory Authority (FINMA), and the offer of shares has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes
(CISA). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of shares.

Our amended and restated certificate of incorporation authorizes us to issue 400,000,000 shares of common stock, $0.01 par value per share,
and 100,000,000 shares of preferred stock, $0.01 per share. As of June 15, 2018, 228,522,514 shares of our common stock were issued and outstanding and 6,123,782 shares of Tellurian Series C convertible preferred stock (the Preferred
Shares) were issued and outstanding.

The rights of the holders of our common stock and Preferred Shares are governed by the
Delaware General Corporation Law (the DGCL), our amended and restated certificate of incorporation, our amended and restated by-laws and the certificate of designations governing the Preferred Shares.

The following is a summary of the material terms of our capital stock, and is qualified in its entirety by reference to the complete text of
our amended and restated certificate of incorporation, our amended and restated by-laws and the certificate of designations governing the Preferred Shares, each of which is incorporated by reference in this prospectus supplement. See Where You
Can Find More Information.

Common Stock

Voting Rights

Holders of common stock are
entitled to one vote for each share held on all matters submitted to a vote of stockholders. Cumulative voting in the election of directors is not permitted. Under our amended and restated by-laws, unless otherwise provided in our amended and
restated certificate of incorporation or the DGCL with respect to a specified action, matters to be voted on by stockholders are generally decided by a majority of the votes cast, except that contested elections of directors will be decided by a
plurality vote. Our amended and restated by-laws provide that the presence at a stockholders meeting of one-third of the voting power of our outstanding stock entitled to vote at the meeting will constitute a quorum.

Dividend and Distribution Rights

Holders
of outstanding shares of our common stock are entitled to dividends when, as, and if declared by our board of directors out of funds legally available for the payment of dividends. As a Delaware corporation, we may pay dividends out of surplus or,
if there is no surplus, out of net profits for the fiscal year in which a dividend is declared and/or the preceding fiscal year. In the event of our liquidation, dissolution, or winding up of our affairs, holders of our common stock will be entitled
to receive ratably our net assets available to the stockholders.

Preemptive, Conversion and Redemption Rights

Holders of our outstanding common stock have no conversion or redemption rights. In addition, holders of our common stock have no preemptive
rights under the DGCL. However, TOTAL Delaware, Inc., a Delaware corporation and subsidiary of TOTAL S.A., has a contractual right to purchase its pro rata portion of any new equity securities that Tellurian may issue to a third party on the same
terms and conditions as such equity securities are offered and sold to such party, subject to certain exceptions. All of the issued and outstanding shares of our common stock are, and all unissued shares of our common stock, when offered and sold
will be, duly authorized, validly issued, fully paid, and nonassessable. To the extent that additional shares of our common stock may be issued in the future, the relative interests of the then-existing stockholders may be diluted.

Our common stock is listed for trading on the Nasdaq Capital Market under the ticker symbol TELL. On June 15, 2018, the
closing price of our common stock as reported on the Nasdaq Capital Market was $11.07 per share.

Registrar and Transfer Agent

Our registrar and transfer agent for all shares of common stock is Broadridge Corporate Issuer Solutions, Inc.

Preferred Stock Generally

Our amended
and restated certificate of incorporation authorizes our board of directors, subject to any limitations prescribed by law, without further stockholder approval, to establish and to issue from time to time one or more classes or series of preferred
stock, covering up to an aggregate of 100,000,000 shares of preferred stock. Each class or series of preferred stock will cover the number of shares and will have the powers, preferences, rights, qualifications, limitations and restrictions
determined by our board of directors, which may include, among others, dividend rights, liquidation preferences, voting rights, conversion rights and redemption rights.

Series C Convertible Preferred Stock

Voting
Rights

Holders of the Preferred Shares will be entitled to one vote for each Preferred Share held on matters submitted to a vote of
common stockholders.

Conversion

Holders of the Preferred Shares may convert all or any portion of such shares for shares of Tellurian common stock on a one-for-one basis. At
any time after Substantial Completion of Project 1, each as defined in and pursuant to the Lump Sum Turnkey Agreement for the Engineering, Procurement and Construction of the Driftwood LNG Phase 1 Liquefaction
Facility, dated as of November 10, 2017, by and between Driftwood LNG LLC, a Delaware limited liability company and a subsidiary of Tellurian, and Bechtel, or at any time after March 21, 2028, Tellurian has the right, at its option, to
cause not less than all of the Preferred Shares to be converted into shares of Tellurian common stock on a one-for-one basis. The conversion ratio will be subject to customary anti-dilution adjustments.

Dividends

The Preferred Shares do not
have dividend rights. Tellurian will be prohibited from paying dividends on its common stock so long as the Preferred Shares remain outstanding.

Liquidation

In the event of any
liquidation, dissolution or winding up of the affairs of Tellurian (a Liquidation Event), after payment or provision for payment of the debts and other liabilities of Tellurian, holders of the Preferred Shares will be entitled to receive
the greater of (i) an amount in cash equal to $8.16489 per Preferred Share and (ii) the amount that would be received by the holders of the Preferred Shares had such holders converted the Preferred Shares into Tellurian common stock
immediately prior to the Liquidation Event.

So long as any Preferred Shares remain outstanding, Tellurian may not, without the consent of the holders of at least a majority of the
Preferred Shares, authorize the issuance of any class of shares that is pari passu with or senior to the Preferred Shares in the payment of dividends or the distribution of assets following a Liquidation Event, except in limited circumstances.

Anti-Takeover Provisions in our Amended and Restated Certificate of Incorporation and Amended and Restated By-Laws

Our amended and restated certificate of incorporation and amended and restated by-laws also contain provisions that we describe in the
following paragraphs, which may delay, defer, discourage, or prevent a change in control of us, the removal of our existing management or directors, or an offer by a potential acquirer to our stockholders, including an offer by a potential acquirer
at a price higher than the market price for the stockholders shares.

Among other things, our amended and restated certificate of
incorporation and amended and restated by-laws:



divide our board of directors into three classes serving staggered three-year terms, which could have the effect of increasing the length of time necessary to change the composition of a majority of the board of
directors;



provide that all vacancies on the board of directors, including newly created directorships, will, except as otherwise required by law, be filled by the vote of a majority of directors then in office;



provide our board of directors with the ability to authorize currently undesignated preferred stock. This ability makes it possible for our board of directors to issue, without stockholder approval, preferred stock with
voting or other rights or preferences designated by the board that could have the effect of impeding the success of any attempt to change control of us;



establish advance notice procedures with regard to stockholder proposals relating to the nomination of candidates for election as directors or new business to be brought before meetings of our stockholders. These
procedures provide that notice of stockholder proposals must be timely given in writing to our corporate secretary prior to the meeting at which the action is to be taken. Generally, to be timely, notice must be received at our principal executive
offices not less than 90 days, and not more than 120 days, prior to the first anniversary of the prior years annual meeting (or, in the case of a special meeting, not less than 90 days or more than 120 days prior to the date of the meeting).
Our amended and restated by-laws specify the information that must be included in a stockholders notice. These requirements may prevent stockholders from bringing matters before the stockholders at an annual or special meeting;



provide that stockholders may not act by written consent in lieu of a meeting unless the action, and the taking of such action by written consent, has been approved in advance by the board of directors;



provide that stockholders are not permitted to call special meetings of stockholders. Only our chairman of the board, president, and the board of directors are permitted to call a special meeting of stockholders; and

provide that our board of directors may alter, amend, or repeal our by-laws or approve new by-laws without further stockholder approval, and provide that a stockholder amendment to the by-laws requires a favorable vote
of two-thirds of the voting power of all outstanding voting stock.

Anti-Takeover Provisions of Delaware Law

We are subject to the anti-takeover provisions of Section 203 of the DGCL. In general, Section 203 prohibits a publicly held Delaware
corporation from engaging in a business combination with an interested stockholder for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business
combination is approved in a prescribed manner.

Section 203 defines a business combination as a merger, asset sale, or
other transaction resulting in a financial benefit to the interested stockholder. Section 203 defines an interested stockholder as a person who, together with affiliates and associates, owns, or, in some cases, within the three
prior years did own, 15% or more of the corporations voting stock. Under Section 203, a business combination between us and an interested stockholder is subject to the three-year moratorium unless:



our board of directors approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder prior to the date the person attained that status;



upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of our voting stock outstanding at the time the transaction
commenced, excluding, for purposes of determining the number of shares outstanding, shares owned by persons who are directors and also officers and employee stock plans in which employee participants do not have the right to determine confidentially
whether shares held under the plan will be tendered in a tender or exchange offer; or



the business combination is approved by our board of directors on or subsequent to the date the person became an interested stockholder and authorized at an annual or special meeting of the stockholders by the
affirmative vote of the holders of at least two-thirds of the outstanding voting stock that is not owned by the interested stockholder.

These provisions may have an anti-takeover effect with respect to transactions not approved in advance by our board of directors, including by
discouraging takeover attempts that might result in a premium over the market price for the shares of our stock and that are favored by the holders of a majority of our then-outstanding stock.

Davis Graham & Stubbs LLP, Denver, Colorado, will pass upon certain legal matters relating to this offering. Certain other legal
matters will be passed upon for the underwriters by Davis Polk & Wardwell LLP, New York, New York.

EXPERTS

The consolidated financial statements, incorporated in this prospectus supplement by reference from the Companys Annual Report on Form
10-K for the year ended December 31, 2017, and the effectiveness of Tellurians internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in
their reports, which is incorporated herein by reference. Such financial statements have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

INDEPENDENT PETROLEUM CONSULTANTS

Certain information contained in the documents we include herein and incorporate by reference into this prospectus supplement and the
accompanying prospectus with respect to the Companys oil and gas reserves is derived from the reports of Netherland, Sewell & Associates, Inc., an independent petroleum engineering firm, and has been included and incorporated by
reference into this prospectus supplement and the accompanying prospectus upon the authority of said firm as experts with respect to the matters covered by such reports and in giving such reports.

We may offer and
sell from time to time common stock, preferred stock and warrants to purchase common stock or preferred stock, in one or more transactions. We may also offer and sell from time to time, in one or more transactions, such securities as may be issuable
upon the conversion, exercise or exchange of preferred stock or warrants. Any securities registered hereunder may be sold separately or as units with the other securities registered hereunder.

This prospectus provides you with a description of our common stock and a general description of the other securities we may offer. A
prospectus supplement containing specific information about the terms of the securities being offered and the offering, including the compensation of any underwriter, agent or dealer, will accompany this prospectus to the extent required. Any
prospectus supplement may also add, update or change information contained in this prospectus. If information in any prospectus supplement is inconsistent with the information in this prospectus, then the information in that prospectus supplement
will apply and will supersede the information in this prospectus. You should carefully read both this prospectus and any prospectus supplement, together with additional information described in Where You Can Find More Information and
Incorporation of Certain Information by Reference, before you invest in our securities.

Our common stock is traded on the
NASDAQ Capital Market under the ticker symbol TELL. On February 9, 2017, the closing price of our common stock as reported on the NASDAQ Capital Market was $14.21 per share. None of the other securities offered under this prospectus
are publicly traded.

INVESTING IN OUR SECURITIES INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CAREFULLY READ THE RISK
FACTORS SECTION BEGINNING ON PAGE 4 OF THIS PROSPECTUS.

Neither the Securities and Exchange Commission nor any
state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (the SEC) using a
shelf registration process on Form S-3. See Where You Can Find More Information and Incorporation of Certain Information by Reference. Under the shelf registration, we
may sell any combination of the securities described in this prospectus in one or more offerings. This prospectus provides you with a description of our common stock and a general description of the other securities that we may offer. Each time that
securities are sold pursuant to the Registration Statement, we will, to the extent required, provide a prospectus supplement that will contain specific information about the terms of the securities being offered and the offering. The prospectus
supplement also may add, update or change information contained or incorporated by reference in this prospectus. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to
these offerings and securities. You should read both this prospectus and any prospectus supplement or free writing prospectus together with additional information described in Where You Can Find More Information and Incorporation
of Certain Information by Reference before you invest.

You should rely only on the information contained in this prospectus and in
any relevant prospectus supplement or free writing prospectus, including any information incorporated herein or therein by reference. We have not authorized any other person to provide you with different information. If anyone provides you with
different or inconsistent information, you should not rely on it. You should not assume that the information in this prospectus, any accompanying prospectus supplement, any free writing prospectus or any document incorporated by reference is
accurate as of any date other than the date on its front cover. Our business, financial condition, results of operations and prospects may have changed since the date indicated on the front cover of such documents. Neither this prospectus nor any
prospectus supplement or free writing prospectus constitutes an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor does this prospectus or a prospectus supplement or
free writing prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction.

In this prospectus, references to Tellurian, the Company, the issuer, we, us or
our refer to Tellurian Inc. (which was, until February 10, 2017, known as Magellan Petroleum Corporation) and its subsidiaries, unless the context suggests otherwise.

WHERE YOU CAN FIND MORE INFORMATION

We are subject to the informational reporting requirements of the Securities and Exchange Act of 1934, as amended (the Exchange
Act), and we file annual, quarterly, and other reports, proxy statements, and other information with the SEC. You may read and copy any document we file with the SEC at the SECs Public Reference Room at 100 F Street, N.E., Washington,
D.C. 20549. Please call the SEC at 1-800-SEC-0330 for more information about the operation of the Public Reference Room. Our SEC
filings are also available to the public at the SECs website at http://www.sec.gov. Our website address is http://www.tellurianinc.com. However, information on our website will not be considered a part of this prospectus.

We have filed with the SEC a registration statement on Form S-3 (together with all exhibits,
amendments and supplements, the Registration Statement) of which this prospectus constitutes a

part, under the Securities Act of 1933, as amended (the Securities Act). This prospectus does not contain all of the information set forth in the Registration Statement, certain parts
of which are omitted in accordance with the rules of the SEC. For further information pertaining to us, reference is made to the Registration Statement. Statements contained in this prospectus, any prospectus supplement or any document incorporated
herein or therein by reference concerning the provisions of documents are necessarily summaries of such documents, and each such statement is qualified in its entirety by reference to the copy of the applicable document filed with the SEC. Copies of
the Registration Statement are on file at the offices of the SEC, and may be inspected without charge at those offices, the address of which is set forth above, and copies may be obtained from the SEC at prescribed rates. The Registration Statement
has been filed electronically through the SECs Electronic Data Gathering, Analysis and Retrieval System and may be obtained through the SEC web site at http://www.sec.gov.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The SEC allows us to incorporate by reference the information we file with it, which means that we can disclose important information to you
by referring you to another document that we have filed with the SEC. You should read the information incorporated by reference because it is an important part of this prospectus. Information in this prospectus supersedes information incorporated by
reference that we filed with the SEC prior to the date of this prospectus, while information that we file later with the SEC will automatically update and supersede the information in this prospectus. We incorporate by reference the following
information or documents that we have filed with the SEC:

●

our Annual Report on Form 10-K for the fiscal year ended June 30, 2016 filed with the SEC on September 14, 2016, as amended by our Annual Report on Form 10-K/A for the fiscal year ended June 30, 2016 filed with the SEC on October 27, 2016;

●

our Quarterly Reports on Form 10-Q for the quarterly period ended September 30, 2016 filed with the SEC on November 14, 2016, and for the quarterly period ended
December 31, 2016 filed with the SEC on February 9, 2017;

●

our Current Reports on Form 8-K filed with the SEC on July 19, 2016, August 2, 2016, August 3, 2016, August 8, 2016, October 5, 2016,
October 12, 2016, November 29, 2016, December 21, 2016, January 5, 2017 and February 10, 2017, and our Current Report on Form 8-K/A filed with the SEC on October 20, 2016; and

●

the description of our common stock contained in our Current Report on Form 8-K filed with the SEC on June 26, 2013, as the same may be further amended from time to
time.

All reports and other documents filed by us pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act
after the date of this prospectus and prior to the termination of this offering shall be deemed to be incorporated by reference into this prospectus and shall be a part hereof from the date of filing of such reports and documents.

Any statement contained in a document incorporated or deemed to be incorporated by reference in this prospectus shall be deemed modified,
superseded or replaced for purposes of this prospectus to the extent that a statement contained in this prospectus, or in any subsequently filed document that also is deemed to be incorporated by reference in this prospectus, modifies, supersedes or
replaces such statement. Any statement so modified, superseded or replaced shall not be deemed,

except as so modified, superseded or replaced, to constitute a part of this prospectus. None of the information that we disclose under Items 2.02 or 7.01 of any Current Report on Form 8-K or any corresponding information, either furnished under Item 9.01 or included as an exhibit thereto, that we may from time to time furnish to the SEC will be incorporated by reference into, or
otherwise included in, this prospectus, except as otherwise expressly set forth in the relevant document. Subject to the foregoing, all information appearing in this prospectus is qualified in its entirety by the information appearing in the
documents incorporated by reference.

We will furnish to you, upon written or oral request, a copy of any or all of the documents that
have been incorporated by reference, including exhibits to those documents. You may request a copy of those filings at no cost by writing or telephoning our corporate secretary at the following address and telephone number:

Tellurian Inc.

Attention: Corporate Secretary

1201 Louisiana Street, Suite 3100

Houston, Texas 77002

Telephone
No.: (832) 962-4000

Except as provided above, no other information, including information on our
website, is incorporated by reference in this prospectus.

ABOUT TELLURIAN INC.

Tellurian plans to own, develop and operate natural gas liquefaction facilities, storage facilities and loading terminals (collectively, the
LNG Facilities) and to pursue complementary business lines in the energy industry. Tellurian owns all of the common stock of Tellurian Investments Inc., a Delaware corporation (Tellurian Investments), which owns a 100%
membership interest in Tellurian LNG LLC, a Delaware limited liability company (Tellurian LNG), a 100% membership interest in Tellurian Services LLC (f/k/a Parallax Services LLC), a Delaware limited liability company (Tellurian
Services), and a 100% ownership interest in Tellurian LNG UK Ltd (Tellurian UK). The assets of Tellurian include its 100% ownership or membership interests in each of Tellurian Investments, Tellurian LNG, Tellurian Services and
Tellurian UK, interests in Horse Hill-1 well and related licenses in the Weald Basin, onshore United Kingdom, an exploration block, NT/P82, in the Bonaparte Basin, offshore Northern Territory, Australia, and
cash held for certain start-up and operating expenses.

Tellurian is planning on developing,
through Tellurian LNG and Tellurian LNGs wholly owned subsidiaries, a liquefied natural gas (LNG) facility with liquefaction capacity of 26 million tonnes per annum on a single site in Calcasieu Parish, Louisiana (the
Driftwood LNG Project). Assuming approximately two years of permitting work and receipt of the appropriate regulatory approvals and financing commitments necessary to commence construction, followed by a four-year construction schedule,
the Driftwood LNG Project could deliver its first LNG as soon as 2022. Tellurian also plans to pursue business that is complementary to its LNG business.

The Company was founded in 1957 and incorporated in Delaware in 1967 as Magellan Petroleum Corporation. We changed our corporate name to
Tellurian Inc. shortly after completing a merger transaction with Tellurian Investments in February 2017. The Companys common stock has been trading on the NASDAQ Stock Market since 1972. It currently trades under the ticker symbol
TELL.

Our principal executive offices are located at 1201 Louisiana Street, Suite 3100, Houston,
Texas 77002, and our telephone number is (832) 962-4000. We maintain a website at http://www.tellurianinc.com. The information contained in, or that can be accessed through, our website is not part of this
prospectus.

RISK FACTORS

Investing in our securities involves a high degree of risk. You should carefully consider the following risks, the risks set forth in the
Risk Factors section of our Annual Report on Form 10-K for the fiscal year ended June 30, 2016, which is incorporated in this prospectus by reference, as well as the risk factors set
forth in any applicable prospectus supplement and the other reports we file from time to time with the SEC that are incorporated by reference in this prospectus. If any of the events described in such Risk Factors disclosures occurs or
such risks otherwise materialize, our business, financial condition, results of operations, cash flows, or prospects could be materially adversely affected.

Risks Relating to Tellurians Business

Tellurian does not expect Tellurian Investments to generate sufficient cash to pay dividends until the completion of construction of the Driftwood LNG
Project by Tellurian LNG and its wholly owned subsidiaries.

Tellurians indirect ownership of 100% of the membership or
ownership interests in each of Tellurian LNG, Tellurian Services LLC and Tellurian UK and cash held for certain start-up and operating expenses comprise substantially all of Tellurians assets.
Tellurians cash flow and consequently its ability to distribute earnings is solely dependent upon the cash flow its subsidiaries receive from the Driftwood LNG Project and the transfer of funds in the form of distributions or otherwise.
Tellurian LNGs ability to complete the Driftwood LNG Project, as discussed further below, is dependent upon its, its subsidiaries and Tellurian Investments ability to obtain necessary regulatory approvals and raise the capital necessary
to fund the development of the project.

Tellurians ability to pay dividends in the future is uncertain and will depend on a variety
of factors including limitations on the ability of it or its subsidiaries to pay dividends under applicable law and/or the terms of debt or other agreements, and the judgment of the board of directors or other governing body of the relevant entity.

In addition, because Tellurian Investments business will have limited asset and geographic diversification, adverse developments in
the natural gas and LNG industry, or to the Driftwood LNG Project, will have a greater impact on Tellurian Investments financial condition than if it maintained a more diverse asset and geographic profile.

Tellurian will be required to seek additional debt and equity financing in the future to complete the Driftwood LNG Project, and may not be able to
secure such financing on acceptable terms, or at all.

Because Tellurian will be unable to generate any revenue from its
operations and expects to be in the development stage for multiple years, Tellurian will need additional financing to provide the capital required to execute its business plan. Tellurian will need significant funding to develop the Driftwood LNG
Project as well as for working capital requirements and other operating and general corporate purposes.

There can be no assurance that Tellurian will be able to raise sufficient capital on acceptable
terms, or at all. If such financing is not available on satisfactory terms, or is not available at all, Tellurian may be required to delay, scale back or eliminate the development of business opportunities, and its operations and financial condition
may be adversely affected to a significant extent.

Debt financing, if obtained, may involve agreements that include liens on its assets
and covenants limiting or restricting the ability to take specific actions, such as paying dividends or making distributions, incurring additional debt, acquiring or disposing of assets and increasing expenses. Debt financing would also be required
to be repaid regardless of Tellurians operating results.

In addition, the ability to obtain financing for the proposed Driftwood
LNG Project is expected to be contingent upon, among other things, Tellurians ability to enter into sufficient long-term commercial agreements prior to the commencement of construction. To date, Tellurian has not entered into any definitive
third-party agreements for the proposed Driftwood LNG Project, and it may not be successful in negotiating and entering into such agreements.

Tellurian Investments and Tellurian LNG have a limited operating history.

Both Tellurian Investments and Tellurian LNG were formed in 2016, and only recently commenced development. Although Tellurians current
directors, managers and officers have prior professional and industry experience, Tellurian Investments and Tellurian LNG have a limited prior operating history, track record and historical financial information upon which you may evaluate
prospects.

Tellurian LNG has not yet commenced the construction of the Driftwood LNG Project. Accordingly, Tellurian expects to incur
significant additional costs and expenses through completion of development and construction of the Driftwood LNG Project. As a result, Tellurian expects operating losses will increase substantially in the remainder of 2016 and thereafter, and
expects to continue to incur operating losses and experience negative operating cash flow through at least 2022.

Failure to retain and attract key
executive officers and other skilled professional and technical employees could have an adverse effect on Tellurians business, results of operations, financial condition, liquidity and prospects.

The success of Tellurians business relies heavily on its executive officers. Should Tellurians executive officers be unable to
perform their duties on behalf of Tellurian, or should Tellurian be unable to retain or attract other members of management, Tellurians business, results of operations, financial condition, liquidity and prospects could be materially impacted.

Tellurian will be subject to risks related to doing business in, and having counterparties based in, foreign countries.

Tellurian may engage in operations or make substantial commitments and investments, or enter into agreements with counterparties, located
outside the United States, which would expose Tellurian to political, governmental, and economic instability and foreign currency exchange rate fluctuations.

Any disruption caused by these factors could harm Tellurians business, results of
operations, financial condition, liquidity and prospects. Risks associated with operations, commitments and investments outside of the United States include but are not limited to risks of:



currency fluctuations;



war or terrorist attack;



expropriation or nationalization of assets;



renegotiation or nullification of existing contracts;



changing political conditions;



changing laws and policies affecting trade, taxation, and investment;



multiple taxation due to different tax structures;



general hazards associated with the assertion of sovereignty over areas in which operations are conducted; and



the unexpected credit rating downgrade of countries in which Tellurian Investments LNG customers are based.

Because Tellurians reporting currency is the United States dollar, any of the operations conducted outside the United States or
denominated in foreign currencies would face additional risks of fluctuating currency values and exchange rates, hard currency shortages and controls on currency exchange. In addition, Tellurian would be subject to the impact of foreign currency
fluctuations and exchange rate changes on its financial reports when translating its assets, liabilities, revenues and expenses from operations outside of the United States into U.S. dollars at then-applicable exchange rates. These translations
could result in changes to the results of operations from period to period.

Tellurian Investments is currently classified as a United States real
property holding company (USRPHC) under applicable tax laws, and non-U.S. investors may be subject to tax withholding and other tax consequences upon a disposition of their shares.

Tellurian Investments is a USRPHC under applicable tax laws, which subjects non-U.S. investors to tax
withholding and other tax consequences upon a disposition of their shares. Tellurian will likely be classified in the same manner, which subjects non-U.S. investors to tax withholding and other tax
consequences upon a disposition of their Tellurian shares. Non-U.S. investors should consult their tax advisors with respect to the application of this to their investment and other U.S. tax rules.

Tellurian Investments is a defendant in a lawsuit that could result in equitable relief and/or monetary damages that could have a material adverse
effect on Tellurians operating results and financial condition.

Tellurian Investments and Tellurian Services, along with
each of Messrs. Houston and Daniels and certain entities in which each of them owned membership interests, as applicable, have been named as defendants in one recently initiated lawsuit. Although Tellurian Investments believes the

plaintiffs claims are without merit, Tellurian Investments may not ultimately be successful and any potential liability Tellurian Investments may incur is not reasonably estimable. However,
even if Tellurian Investments is successful in the defense of this litigation, Tellurian Investments could incur costs and suffer both an economic loss and an adverse impact on its reputation, which could have a material adverse effect on its
business. In addition, any adverse judgment or settlement of the litigation could have an adverse effect on its operating results and financial condition.

Tellurians estimated costs for the Driftwood LNG Project may not be accurate and are subject to change due to various factors.

Tellurian currently estimates that the construction costs for the Driftwood LNG Project will be between approximately $13 billion and
$15 billion. However, cost estimates are only an approximation of the actual costs of construction and are before owners costs, financing costs, pipeline construction costs and contingencies. Moreover, cost estimates may change due to
various factors, such as the final terms of any definitive request for services with its engineering, procurement and construction (EPC) service provider, as well as change orders, delays in construction, legal and regulatory
requirements, site issues, increased component and material costs, escalation of labor costs, labor disputes, increased spending to maintain Tellurians construction schedule and other factors.

The construction and operation of the Driftwood LNG Project remains subject to further approvals, and some approvals may be subject to further
conditions, review and/or revocation.

The design, construction and operation of LNG export terminals is a highly regulated
activity. The approval of the U.S. Federal Energy Regulatory Commission (FERC) under Section 3 of the Natural Gas Act, as well as several other material governmental and regulatory approvals and permits, is required in order to
construct and operate an LNG terminal. Although the necessary authorizations to operate the proposed LNG Facilities may be obtained, such authorizations are subject to ongoing conditions imposed by regulatory agencies, and additional approval and
permit requirements may be imposed.

Tellurian will be required to obtain governmental approvals and authorizations to implement its
proposed business strategy, which includes the construction and operation of the Driftwood LNG Project. In particular, authorization from FERC and the U.S. Department of Energy is required to construct and operate the proposed LNG Facilities. In
addition to seeking approval for export to countries with which the United States has a Free Trade Agreement (FTA), Tellurian will seek to obtain approval for export to non-FTA countries. There is
no assurance that Tellurian will obtain and maintain these governmental permits, approvals and authorizations, and failure to obtain and maintain any of these permits, approvals or authorizations could have a material adverse effect on its business,
results of operations, financial condition and prospects.

Tellurian will be dependent on third-party contractors for the successful completion of
the Driftwood LNG Project, and these contractors may be unable to complete the Driftwood LNG Project.

There is limited recent
industry experience in the United States regarding the construction or operation of large-scale liquefaction facilities. The construction of the Driftwood LNG Project is expected to take several years, will be confined to a limited geographic area
and could be subject to delays, cost overruns, labor disputes and other factors that could adversely affect financial performance or impair Tellurians ability to execute its scheduled business plan.

Timely and cost-effective completion of the Driftwood LNG Project in compliance with agreed-upon
specifications will be highly dependent upon the performance of third-party contractors pursuant to their agreements. However, Tellurian has not yet entered into definitive agreements with certain of the contractors, advisors and consultants
necessary for the development and construction of the Driftwood LNG Project. Tellurian may not be able to successfully enter into such construction contracts on terms or at prices that are acceptable to it.

Further, faulty construction that does not conform to Tellurians design and quality standards may have an adverse effect on
Tellurians business, results of operations, financial condition and prospects. For example, improper equipment installation may lead to a shortened life of Tellurians equipment, increased operations and maintenance costs or a reduced
availability or production capacity of the affected facility. The ability of Tellurians third-party contractors to perform successfully under any agreements to be entered into is dependent on a number of factors, including force majeure events
and such contractors ability to:



design, engineer and receive critical components and equipment necessary for the Driftwood LNG Project to operate in accordance with specifications and address any start-up and
operational issues that may arise in connection with the commencement of commercial operations;



attract, develop and retain skilled personnel and engage and retain third-party subcontractors, and address any labor issues that may arise;



post required construction bonds and comply with the terms thereof, and maintain their own financial condition, including adequate working capital;



adhere to any warranties the contractors provide in their EPC contracts; and



respond to difficulties such as equipment failure, delivery delays, schedule changes and failure to perform by subcontractors, some of which are beyond their control, and manage the construction process generally,
including engaging and retaining third-party contractors, coordinating with other contractors and regulatory agencies and dealing with inclement weather conditions.

Furthermore, Tellurian may have disagreements with its third-party contractors about different elements of the construction process, which
could lead to the assertion of rights and remedies under the related contracts, resulting in a contractors unwillingness to perform further work on the relevant project. Tellurian may also face difficulties in commissioning a newly constructed
facility. Any significant project delays in the development of the Driftwood LNG Project could materially and adversely affect Tellurians business, results of operations, financial condition and prospects.

Tellurians ability to generate cash is substantially dependent upon it entering into contracts with third parties and the performance of those
customers under those contracts.

Tellurian has not yet entered into, and may never be able to enter into, satisfactory commercial
arrangements with third-party customers for products and services at the Driftwood LNG Project.

Tellurians business strategy may
change regarding how and when the proposed Driftwood LNG Projects export capacity is marketed. Also, Tellurians business strategy may change due to the

inability to enter into agreements with customers or based on views regarding future prices, supply and demand of LNG, natural gas liquefaction capacity, and worldwide regasification capacity. If
the efforts to market the proposed Driftwood LNG Project are not successful, Tellurians business, results of operations, financial condition and prospects may be materially and adversely affected.

Tellurian LNGs construction and operations activities are subject to a number of development risks, operational hazards, regulatory approvals and
other risks, which could cause cost overruns and delays and could have a material adverse effect on its business, results of operations, financial condition, liquidity and prospects.

Siting, development and construction of the Driftwood LNG Project will be subject to the risks of delay or cost overruns inherent in any
construction project resulting from numerous factors, including, but not limited to, the following:

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Difficulties or delays in obtaining, or failure to obtain, sufficient debt or equity financing on reasonable terms;



Failure to obtain all necessary government and third-party permits, approvals and licenses for the construction and operation of any of the contemplated LNG Facilities;



Failure to obtain sale and purchase agreements that generate sufficient revenue to support the financing and construction of the Driftwood LNG Project;



Difficulties in engaging qualified contractors necessary to the construction of the contemplated Driftwood LNG Project or other LNG Facilities;

Competition with other domestic and international LNG export terminals;



Unanticipated changes in domestic and international market demand for and supply of natural gas and LNG, which will depend in part on supplies of and prices for alternative energy sources and the discovery of new
sources of natural resources;



Unexpected or unanticipated additional improvements; and



Adverse general economic conditions.

Delays beyond the estimated development periods, as well
as cost overruns, could increase the cost of completion beyond the amounts that are currently estimated, which could require Tellurian to obtain additional sources of financing to fund the activities until the proposed Driftwood LNG Project is
constructed and operational (which could cause further delays). Any delay in completion of the

Driftwood LNG Project may also cause a delay in the receipt of revenues projected from the Driftwood LNG Project or cause a loss of one or more customers. As a result, any significant
construction delay, whatever the cause, could have a material adverse effect on Tellurians business, results of operations, financial condition, liquidity and prospects.

Tellurians success will depend on its ability to create and maintain a competitive position in the natural gas liquefaction industry. In
particular, although Tellurian plans to construct the Driftwood LNG Project using proven technologies that it believes provides it with certain advantages, Tellurian does not have any exclusive rights to any of the technologies that it will be
utilizing. In addition, the technology Tellurian anticipates using in the Driftwood LNG Project may be rendered obsolete or uneconomical by legal or regulatory requirements, technological advances, more efficient and cost-effective processes or
entirely different approaches developed by one or more of its competitors or others, which could materially and adversely affect Tellurians business, results of operations, financial condition, liquidity and prospects.

Decreases in the demand for and price of natural gas could lead to reduced development of LNG projects worldwide.

Tellurian is subject to risks associated with the development, operation and financing of domestic LNG facilities. The development of domestic
LNG facilities and projects are generally based on assumptions about the future price of natural gas and LNG and the conditions of the global natural gas and LNG markets. Natural gas and LNG prices have been, and are likely to remain in the future,
volatile and subject to wide fluctuations that are difficult to predict. Such fluctuations may be caused by factors such as the competitive liquefaction capacity in North America; the international supply and receiving capacity of LNG; LNG tanker
capacity; weather conditions; domestic and global demand for natural gas; the effect of government regulation on the production, transportation and sale of natural gas; oil and natural gas exploration and production activities; the development of
and changes in the cost of alternative energy sources for natural gas and political and economic conditions worldwide.

Further, the
development of liquefaction facilities takes a substantial amount of time, requires significant capital investment, may be delayed by unforeseen and uncontrollable factors and is dependent on the financial viability and ability of Tellurian to
market LNG internationally.

Competition in the liquefied natural gas industry is intense, and some of Tellurians competitors have greater
financial, technological and other resources.

Tellurian plans to operate in the highly competitive area of liquefied natural gas
production and faces intense competition from independent, technology-driven companies as well as from both major and other independent oil and natural gas companies and utilities.

Many competing companies have secured access to, or are pursuing development or acquisition of, LNG facilities to serve the North American
natural gas market, including other proposed liquefaction facilities in North America. Tellurian may face competition from major energy companies and others in pursuing its proposed business strategy to provide liquefaction and export products and
services at its proposed Driftwood LNG Project. In addition, competitors have and are developing additional LNG terminals in other markets, which also compete with the proposed LNG

Facilities. Almost all of these competitors have longer operating histories, more development experience, greater name recognition, larger staffs and substantially greater financial, technical
and marketing resources than Tellurian currently possesses. The superior resources that these competitors have available for deployment could allow them to compete successfully against Tellurian, which could have a material adverse effect on
Tellurians business, results of operations, financial condition, liquidity and prospects.

There may be shortages of LNG vessels worldwide,
which could have a material adverse effect on Tellurians business, results of operations, financial condition, liquidity and prospects.

The construction and delivery of LNG vessels requires significant capital and long construction lead times, and the availability of the
vessels could be delayed to the detriment of Tellurians business and customers due to the following:

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an inadequate number of shipyards constructing LNG vessels and a backlog of orders at these shipyards;

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political or economic disturbances in the countries where the vessels are being constructed;

weather interference or catastrophic events, such as a major earthquake, tsunami, or fire; or



shortages of or delays in the receipt of necessary construction materials.

A terrorist or military
incident involving an LNG carrier could result in delays in, or cancellation of, construction or closure of the proposed LNG Facilities.

A terrorist or military incident involving an LNG carrier may result in delays in, or cancellation of, construction of new LNG facilities,
including the proposed LNG Facilities, which would increase Tellurians costs and decrease cash flows. A terrorist incident may also result in temporary or permanent closure of Tellurians proposed LNG Facilities, including the Driftwood
LNG Project, which could increase costs and decrease cash flows, depending on the duration of the closure. Operations at the proposed LNG Facilities, including the Driftwood LNG Project, could also become subject to increased governmental scrutiny
that may result in additional security measures at a significant incremental cost. In addition, the threat of terrorism and the impact of military campaigns may lead to continued volatility in prices for natural gas that could adversely affect
Tellurians business and customers, including the ability of Tellurians suppliers or customers to satisfy their respective obligations under Tellurians commercial agreements.

Changes in legislation and regulations relating to the LNG industry could have a material adverse impact on Tellurians business, results of
operations, financial condition, liquidity and prospects.

Future legislation and regulations, such as those relating to the
transportation and security of LNG exported from the proposed LNG Facilities through the Calcasieu Ship Channel, could cause

additional expenditures, restrictions and delays in connection with the proposed LNG Facilities and their construction, the extent of which cannot be predicted and which may require Tellurian to
limit substantially, delay or cease operations in some circumstances. Revised, reinterpreted or additional laws and regulations that result in increased compliance costs or additional operating costs and restrictions could have a material adverse
effect on Tellurians business, results of operations, financial condition, liquidity and prospects.

Tellurians operations will be
subject to a number of environmental laws and regulations that impose significant compliance costs, and existing and future environmental and similar laws and regulations could result in increased compliance costs or additional operating
restrictions.

Tellurians business will be subject to extensive federal, state and local regulations and laws, including
regulations and restrictions on discharges and releases to the air, land and water and the handling, storage and disposal of hazardous materials and wastes in connection with the development, construction and operation of its liquefaction
facilities. These regulations and laws will require Tellurian to maintain permits, provide governmental authorities with access to its facilities for inspection and provide reports related to its compliance. Violation of these laws and regulations
could lead to substantial fines and penalties or to capital expenditures related to pollution control equipment that could have a material adverse effect on Tellurians business, results of operations, financial condition, liquidity and
prospects. Federal and state laws impose liability, without regard to fault or the lawfulness of the original conduct, for the release of certain types or quantities of hazardous substances into the environment. As the owner and operator of the
Driftwood LNG Project, Tellurian could be liable for the costs of cleaning up hazardous substances released into the environment and for damage to natural resources.

In addition, future federal, state and local legislation and regulations may impose unforeseen burdens and increased costs on Tellurians
business that could have a material adverse effect on Tellurians financial results, such as regulations regarding greenhouse gas emissions and the transportation of LNG.

The operation of the proposed Driftwood LNG Project may be subject to significant operating hazards and uninsured risks, one or more of which may create
significant liabilities and losses that could have a material adverse effect on Tellurians business, results of operations, financial condition, liquidity and prospects.

The plan of operations for the proposed Driftwood LNG Project is subject to the inherent risks associated with LNG operations, including
explosions, pollution, release of toxic substances, fires, hurricanes and other adverse weather conditions, and other hazards, each of which could result in significant delays in commencement or interruptions of operations and/or result in damage to
or destruction of the proposed Driftwood LNG Project and assets or damage to persons and property. In addition, operations at the proposed Driftwood LNG Project and vessels of third parties on which Tellurians operations are dependent face
possible risks associated with acts of aggression or terrorism.

Tellurian does not, nor does it intend to, maintain insurance against all
of these risks and losses. Tellurian may not be able to maintain desired or required insurance in the future at rates that it considers reasonable. The occurrence of a significant event not fully insured or indemnified against could have a material
adverse effect on Tellurians business, contracts, financial condition, operating results, cash flow, liquidity and prospects.

Financial projections by Tellurian Investments may not prove to be reflective of actual future results.

In connection with the merger, Tellurian Investments prepared and considered, among other things, internal financial forecasts
for Tellurian Investments. These financial projections include assumptions regarding future revenue, EBITDA, capital expenditures and unlevered free cash flow. They speak only as of the date prepared and have not been, and will not be, updated.
These financial projections were not provided with a view to public disclosure, are subject to significant economic, competitive, industry and other uncertainties and may not be achieved in full, at all or within projected timeframes. In addition,
the failure to achieve projected results could have a material adverse effect on Tellurians share price and financial position.

CAUTIONARY INFORMATION ABOUT FORWARD-LOOKING STATEMENTS

The information in this prospectus, including information in documents
incorporated by reference in this prospectus, includes forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. All statements, other than statements of historical
facts, that address activities, events, or developments with respect to our financial condition, results of operations, or economic performance that we expect, believe, or anticipate will or may occur in the future, or that address plans and
objectives of management for future operations, are forward-looking statements. The words anticipate, assume, believe, budget, estimate, expect, forecast,
initial, intend, may, plan, potential, project, should, will, would, and similar expressions are intended to identify forward-looking
statements. These forward-looking statements relate to, among other things:

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our businesses and prospects;

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our ability to continue as a going concern;

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planned or estimated capital expenditures;

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availability of liquidity and capital resources;

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the ability to obtain additional financing as needed;

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revenues, expenses, and projected cash burn rates;

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progress in developing the Companys principal project and the timing of that progress;

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future values of that project or other interests or rights that the Company holds; and

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government regulations, including our ability to obtain necessary governmental permits and approvals.

Our forward-looking statements are based on assumptions and analyses made by us in light of our experience and our perception of historical
trends, current conditions, expected future developments, and other factors that we believe are appropriate under the circumstances. These statements are subject to a number of known and unknown risks and uncertainties, which may cause our actual
results and performance to be materially different from any future results or performance

expressed or implied by the forward-looking statements. These risks and uncertainties are described in the Risk Factors section and elsewhere in reports we file with the SEC
incorporated by reference in this prospectus, and additional risk factors that may be set forth in any applicable prospectus supplement, and include such factors as:

The forward-looking statements in
this prospectus, or in any prospectus supplement, speak as of the date hereof, or thereof, as applicable. Although we may from time to time voluntarily update our prior forward-looking statements, we disclaim any commitment to do so except as
required by securities laws.

Unless a prospectus supplement indicates otherwise, the net proceeds we receive from the sale of the securities offered by this prospectus
will be used for general corporate purposes. Pending the application of the net proceeds from any particular offering, we intend to invest such proceeds in short- and intermediate-term, interest-bearing obligations, investment-grade instruments,
certificates of deposit or direct or guaranteed obligations of the U.S. government.

Each time we issue securities, we will provide a
prospectus supplement that will contain information about how we intend to use the proceeds from each such offering. We will bear all of the expenses of the offering of the securities, and such expenses will be paid out of our general funds, unless
otherwise stated in the applicable prospectus supplement.

We cannot guarantee that we will receive any proceeds in connection with any
offering hereunder because we may choose not to issue any of the securities covered by this prospectus.

PLAN
OF DISTRIBUTION

We may sell securities under this prospectus and any relevant prospectus supplement to or through underwriters or
dealers, directly to other purchasers or through agents. In addition, we may from time to time sell securities through a bidding or auction process, block trades, ordinary brokerage transactions or transactions in which a broker solicits purchasers.
We may also use a combination of any of the foregoing methods of sale. We may distribute the securities from time to time in one or more transactions at a fixed price or prices (which may be changed from time to time), at market prices prevailing at
the times of sale, at prices related to these prevailing market prices or at negotiated prices. We may offer securities in the same offering or in separate offerings. From time to time, we may exchange securities for indebtedness or other securities
that we may have outstanding. In some cases, dealers acting for us may also purchase securities and re-offer them to the public by one or more of the methods described above.

Any person participating in the distribution of common stock registered under the Registration Statement that includes this prospectus will be
subject to applicable provisions of the Exchange Act and applicable SEC rules and regulations, including, among others, Regulation M, which may limit the timing of purchases and sales of any of our common stock by any such person. Furthermore,
Regulation M may restrict the ability of any person engaged in the distribution of our common stock to engage in market-making activities with respect to our common stock. These restrictions may affect the marketability of our common stock and
the ability of any person or entity to engage in market-making activities with respect to our common stock.

Certain persons participating
in an offering may engage in over-allotment, stabilizing transactions, short-covering transactions and penalty bids in accordance with Regulation M under the Exchange Act that stabilize, maintain or otherwise affect the price of the offered
securities. If any such activities may occur, they will be described in the applicable prospectus supplement or a document incorporated by reference to the extent required.

We will provide required disclosure concerning the terms of the offering of the securities in a prospectus supplement or information
incorporated by reference, including, to the extent applicable:

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the name or names of underwriters, dealers or agents;

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the purchase price of the securities and the proceeds we will receive from the sale;

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any underwriting discounts, commissions, and other items constituting underwriters compensation;

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any over-allotment options under which underwriters may purchase additional securities from us;

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any commissions paid to agents;

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any discounts or concessions allowed or reallowed or paid to dealers; and

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any securities exchange or market on which the securities may be listed.

The distribution of securities may
be effected, from time to time, in one or more transactions, including:

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underwritten offerings;

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block transactions (which may involve crosses) and transactions on the NASDAQ Capital Market or any other organized market where the securities may be traded;

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purchases by a broker-dealer as principal and resale by the broker-dealer for its own account;

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ordinary brokerage transactions and transactions in which a broker-dealer solicits purchasers;

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sales at the market to or through a market maker or into an existing trading market, on an exchange or otherwise;

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sales in other ways not involving market makers or established trading markets, including direct sales to purchasers through registered direct offerings or otherwise; and

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any other method permitted pursuant to applicable law.

Dealers and agents participating in
the distribution of the securities may be deemed to be underwriters, and compensation received by them on resale of the securities may be deemed to be underwriting discounts and commissions under the Securities Act. If such dealers or agents were
deemed to be underwriters, they may be subject to statutory liabilities under the Securities Act. Unless otherwise indicated, any agent will be acting on a best efforts basis for the period of its appointment.

If underwriters are used in an offering, securities will be acquired by the underwriters for
their own account and may be resold, from time to time, in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale, or under delayed delivery contracts or
other contractual commitments. Securities may be offered to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. If an underwriter or underwriters
are used in the sale of securities, an underwriting agreement will be executed with the underwriter or underwriters at the time an agreement for the sale is reached. The applicable prospectus supplement will set forth the managing underwriter or
underwriters, as well as any other underwriter or underwriters, with respect to a particular underwritten offering of securities, and will set forth the terms of the transactions, including compensation of the underwriters and dealers and the public
offering price, if applicable.

If a dealer is used in the sale of the securities, we or an underwriter will sell the securities to the
dealer as principal. The dealer may then resell the securities to the public at varying prices to be determined by the dealer at the time of resale.

We may directly solicit offers to purchase the securities and may make sales of securities directly to institutional investors or others.
These persons may be deemed to be underwriters within the meaning of the Securities Act with respect to any resale of the securities. To the extent required, the prospectus supplement or document incorporated by reference, as applicable, will
describe the terms of any such sales, including the terms of any bidding or auction process, if used.

Underwriters, dealers and agents
may be entitled under agreements that may be entered into with us to indemnification by us against specified liabilities, including liabilities incurred under the Securities Act, or to contribution by us to payments they may be required to make in
respect of such liabilities. If required, the prospectus supplement or document incorporated by reference, as applicable, will describe the terms and conditions of such indemnification or contribution. Some of the agents, underwriters or dealers, or
their affiliates, may be customers of, engage in transactions with or perform services for us, our subsidiaries or affiliates in the ordinary course of business.

In addition, we may enter into derivative transactions with third parties, in which case the third parties may sell securities covered by this
prospectus and the applicable prospectus supplement or incorporated document and received by those parties in settlement of a derivative position.

To the extent required, this prospectus will be amended or supplemented from time to time to describe a specific plan of distribution.

Other than common stock, all securities sold under this prospectus will be new issues of securities with no established trading market. Any
underwriters may make a market in these securities but will not be obligated to do so and may discontinue any market making at any time without notice. We cannot guarantee the liquidity of the trading markets for any securities.

DESCRIPTION OF OUR CAPITAL STOCK

Our restated certificate of incorporation authorizes us to issue 300,000,000 shares of common stock, $0.01 par value per share, and 50,000,000
shares of preferred stock, $0.01 per share. As of February 10, 2017, 199,382,948 shares of our common stock were issued and outstanding, net of 1,209,389 treasury shares held by us, and no shares of our preferred stock were issued and
outstanding.

The rights of the holders of our common stock and preferred stock are governed by the Delaware
General Corporation Law (the DGCL), our restated certificate of incorporation and our amended and restated by-laws.

Common Stock

The following is a summary
of the material terms of our common stock, and is qualified in its entirety by reference to the complete text of our restated certificate of incorporation and our amended and restated by-laws, each of which is
incorporated by reference in this prospectus. See Where You Can Find More Information.

Voting Rights

Holders of common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders. Cumulative voting in
the election of directors is not permitted. Section 216 of the DGCL provides that, generally, unless otherwise provided in our certificate of incorporation or our by-laws or another section of the DGCL
with respect to a specified action, all matters to be voted on by stockholders must be approved by the affirmative vote of the majority of shares present or represented by proxy at the meeting and entitled to vote, or, in the case of the election of
directors, by a plurality of the votes of shares present or represented by proxy at the meeting and entitled to vote, in each case at a meeting at which a quorum is present. With respect to certain matters where the NASDAQ Capital Market shareholder
approval requirements are applicable, the NASDAQ Capital Market rules require approval by a majority of the total votes cast on the proposal.

Dividend
and Distribution Rights

Holders of outstanding shares of our common stock are entitled to dividends when, as, and if declared by our
board of directors out of funds legally available for the payment of dividends. As a Delaware corporation, we may pay dividends out of surplus or, if there is no surplus, out of net profits for the fiscal year in which a dividend is declared and/or
the preceding fiscal year. In the event of our liquidation, dissolution, or winding up of our affairs, holders of our common stock will be entitled to receive ratably our net assets available to the stockholders.

Preemptive, Conversion and Redemption Rights

Holders of our outstanding common stock have no conversion or redemption rights. In addition, holders of our common stock have no preemptive
rights under the DGCL. However, TOTAL Delaware, Inc., a Delaware corporation and subsidiary of TOTAL S.A., has a right to purchase its pro rata portion of any new equity securities that Tellurian may issue to a third party on the same terms and
conditions as such equity securities are offered and sold to such party, subject to certain exceptions. All of the issued and outstanding shares of our common stock are, and all unissued shares of our common stock, when offered and sold will be,
duly authorized, validly issued, fully paid, and nonassessable. To the extent that additional shares of our common stock may be issued in the future, the relative interests of the then-existing stockholders may be diluted.

Trading Market

Our common stock is
listed for trading on the NASDAQ Capital Market under the ticker symbol TELL. On February 9, 2017, the closing price of our common stock as reported on the NASDAQ Capital Market was $14.21 per share.

Our registrar and transfer agent for all shares of common stock is Broadridge Corporate Issuer Solutions, Inc.

Preferred Stock

Our restated
certificate of incorporation authorizes our board of directors, subject to any limitations prescribed by law, without further stockholder approval, to establish and to issue from time to time one or more classes or series of preferred stock,
covering up to an aggregate of 50,000,000 shares of preferred stock. Each class or series of preferred stock will cover the number of shares and will have the powers, preferences, rights, qualifications, limitations and restrictions determined by
our board of directors, which may include, among others, dividend rights, liquidation preferences, voting rights, conversion rights and redemption rights.

Anti-Takeover Provisions in our Restated Certificate of Incorporation and Amended and Restated By-Laws

Our restated certificate of incorporation and amended and restated by-laws also contain provisions
that we describe in the following paragraphs, which may delay, defer, discourage, or prevent a change in control of us, the removal of our existing management or directors, or an offer by a potential acquirer to our stockholders, including an offer
by a potential acquirer at a price higher than the market price for the stockholders shares.

Among other things, our restated
certificate of incorporation and amended and restated by-laws:

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divide our board of directors into three classes serving staggered three-year terms, which could have the effect of increasing the length of time necessary to change the composition of a majority of the board of
directors;

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provide that all vacancies on the board of directors, including newly created directorships, may, except as otherwise required by law, be filled by the vote of a majority of directors then in office;

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provide our board of directors with the ability to authorize currently undesignated preferred stock. This ability makes it possible for our board of directors to issue, without stockholder approval, preferred stock with
voting or other rights or preferences designated by the board that could have the effect of impeding the success of any attempt to change control of us;

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establish advance notice procedures with regard to stockholder proposals relating to the nomination of candidates
for election as directors or new business to be brought before meetings of our stockholders. These procedures provide that notice of stockholder proposals must be timely given in writing to our corporate secretary prior to the meeting at which the
action is to be taken. Generally, to be timely, notice must be received at our principal executive offices not less than 60 days prior to the meeting, provided that in the event that less than 70 days notice or prior public disclosure of the
date of the meeting is given or made to stockholders, notice by the stockholder must be received not more than

10 days following the date on which such notice of the meeting date was mailed or public disclosure given. Our by-laws specify the requirements as to the
form and content of all stockholders notices. These requirements may preclude stockholders from bringing matters before the stockholders at an annual or special meeting;

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provide that stockholders are not permitted to call special meetings of stockholders. Only our chairman of the board, president, and the board of directors are permitted to call a special meeting of stockholders; and

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provide that our board of directors may alter, amend, or repeal our by-laws or approve new by-laws without further stockholder approval,
and provide that a stockholder amendment to the by-laws requires a favorable vote of 66 2⁄3% of the voting power of all
outstanding voting stock.

Anti-Takeover Provisions of Delaware Law

We are subject to the anti-takeover provisions of Section 203 of the DGCL. In general, Section 203 prohibits a publicly held
Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the
business combination is approved in a prescribed manner.

Section 203 defines a business combination as a merger, asset
sale, or other transaction resulting in a financial benefit to the interested stockholder. Section 203 defines an interested stockholder as a person who, together with affiliates and associates, owns, or, in some cases, within the
three prior years, did own, 15% or more of the corporations voting stock. Under Section 203, a business combination between us and an interested stockholder is subject to the three-year moratorium unless:

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our board of directors approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder prior to the date the person attained that status;

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upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of our voting stock outstanding at the time the transaction
commenced, excluding, for purposes of determining the number of shares outstanding, shares owned by persons who are directors and also officers and employee stock plans in which employee participants do not have the right to determine confidentially
whether shares held under the plan will be tendered in a tender or exchange offer; or

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the business combination is approved by our board of directors on or subsequent to the date the person became an interested stockholder and authorized at an annual or special meeting of the stockholders by the
affirmative vote of the holders of at least 66 2⁄3% of the outstanding voting stock that is not owned by the interested stockholder.

These provisions may have an anti-takeover effect with respect to transactions not approved in advance by our board of directors, including by
discouraging takeover attempts that might result in a premium over the market price for the shares of our stock. With approval of our stockholders, we could amend our certificate of incorporation in the future to elect not to be governed by these
anti-takeover provisions.

The following is a summary of the general terms of any warrants that we may offer under this prospectus and related warrant agreements and
certificates. You should refer to the warrant agreement, including the form of warrant certificate representing the warrants, relating to the specific warrants being offered for complete terms, which will be described in an accompanying prospectus
supplement. Such warrant agreement, together with the warrant certificate, will be filed with the SEC in connection with the offering of the specific warrants.

We may issue warrants for the purchase of common stock, preferred stock or any combination thereof. Warrants may be issued independently or
together with any other offered securities, and may be attached to or separate from any offered securities.

We will evidence each series
of warrants by warrant certificates that we will issue under a separate warrant agreement. We may enter into an agreement with a warrant agent and, if so, we will indicate the name and address of the warrant agent in the applicable prospectus
supplement relating to the particular series of warrants.

The particular terms of any issue of warrants will be described in the
prospectus supplement relating to the series. Those terms may include:

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the title of such warrants;

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the aggregate number of such warrants;

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the price or prices at which such warrants will be issued;

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the currency or currencies (including composite currencies) in which the price of such warrants may be payable;

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the terms of the securities issuable upon exercise of such warrants and the procedures and conditions relating to the exercise of such warrants;

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the price at which the securities issuable upon exercise of such warrants may be acquired;

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the dates on which the right to exercise such warrants will commence and expire;

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any provisions for adjustment of the number or amount of securities receivable upon exercise of the warrants or the exercise price of the warrants;

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if applicable, the minimum or maximum amount of such warrants that may be exercised at any one time;

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if applicable, the designation and terms of the securities with which such warrants are issued and the number of such warrants issued with each such security or principal amount of such security;



if applicable, the date on and after which such warrants and the related securities will be separately transferable;

any other terms of such warrants, including terms, procedures, and limitations relating to the exchange or exercise of such warrants.

As of February 10, 2017, the Company had no outstanding warrants.

Exercise of Warrants

Each warrant will
entitle its holder to purchase the number of shares of common stock, preferred stock or combination thereof at the exercise price set forth in, or calculable as set forth in, the applicable prospectus supplement. Unless we otherwise describe in the
applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the expiration date set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants
will become void. We will describe in the applicable prospectus supplement the place or places where, and the manner in which, warrants may be exercised. We will set forth on the reverse side of the applicable warrant certificate and in the
applicable prospectus supplement the information that the holder of the warrant will be required to deliver upon exercise.

Upon receipt
of payment and the warrant certificate properly completed and duly executed, we will, as soon as practicable, forward the purchased securities. If less than all of the warrants represented by the warrant certificate are exercised, a new warrant
certificate will be issued for the remaining unexercised warrants.

Enforceability of Rights by Holders of Warrants

Each warrant agent will act solely as our agent under the applicable warrant agreement and will not assume any obligation or relationship of
agency or trust with any holder of any warrant. A single bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility in case of any default by us under the applicable
warrant agreement or warrant, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a warrant may, without the consent of the related warrant agent or the holder of any
other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable upon exercise of, such holders warrants.

Prior to the exercise of any warrants to purchase the purchased securities, holders of the warrants will not have any of the rights of holders
of the common stock or the preferred stock, as applicable, purchasable upon exercise, including the right to vote or to receive any payments of dividends, as applicable.

We may issue units comprised of any combination of our common stock, preferred stock and warrants. Each unit will be issued so that the holder
of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each included security. The units may be issued under unit agreements to be entered into between us
and a bank or trust company, as unit agent, as described in the prospectus supplement relating to units being offered. The prospectus supplement will describe:

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the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances the securities comprising the units may be held or transferred separately;

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a description of the terms of any unit agreement governing the units;

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a description of the provisions for the payment, settlement, transfer, or exchange of the units;

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a discussion of material federal income tax considerations, if applicable; and

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whether the units will be issued in fully registered or global form.

The descriptions of the
units in this prospectus and in any prospectus supplement are summaries of the material provisions of the applicable unit agreements. These descriptions do not contain all of the provisions of those unit agreements in their entirety and may not
contain all the information that you may find useful. We urge you to read the applicable unit agreements because they, and not the summaries, define your rights as holders of the units. For more information, please review the form of the relevant
unit agreements, which will be filed with the SEC in connection with the offering of units and will be available as described under the heading Where You Can Find More Information.

The applicable provisions described in this section, as well as those described under Description of Our Capital Stock and
Description of Our Warrants above, will apply to each unit and to each security included in each unit, respectively.

LEGAL MATTERS

Davis Graham & Stubbs LLP of Denver, Colorado, has provided its opinion on the validity of the securities
offered by this prospectus. If legal matters in connection with offerings made under this prospectus are acted on by counsel for the underwriters, dealers or agents, if any, that counsel will be named in the applicable prospectus supplement to the
extent required.

EXPERTS

Tellurian Inc. was formerly known as Magellan Petroleum Corporation; it changed its name to Tellurian Inc. shortly after the completion of the
merger contemplated by that certain Agreement and Plan of Merger, dated as of August 2, 2016, by and among Magellan Petroleum Corporation, Tellurian Investments and River Merger Sub, Inc., a Delaware corporation. As a result of the merger,
Tellurian Investments became a subsidiary of Magellan Petroleum Corporation. However, the managements of

those entities determined that Tellurian Investments was the accounting acquirer in the transaction for purposes of Financial Accounting Standards Boards Accounting Standards
Codification 805, Business Combinations. Accordingly, the financial statements of Tellurian Services, LLC, the predecessor of Tellurian Investments, are considered under applicable SEC guidance to be the financial statements of the registrant.
Certain historical information of Magellan Petroleum Corporation is also included in this prospectus supplement as noted below.

The
financial statements of Tellurian Services LLC as of April 9, 2016, December 31, 2015 and 2014 and for the period from January 1, 2016 to April 9, 2016 and for the years ended December 31, 2015 and 2014, appearing in Registration Statement No. 333-213923 of Tellurian Inc. (formerly known as Magellan Petroleum Corporation) on Form S-4 and incorporated in this Registration Statement by reference to Tellurian Inc.s Current Report on Form 8-K dated
February 10, 2017, have been audited by Deloitte & Touche LLP, independent auditors, as stated in their report, which is herein incorporated by reference. Such financial statements have been so incorporated in reliance upon the report of such
firm given upon their authority as experts in accounting and auditing.

The consolidated financial statements of Magellan Petroleum
Corporation as of June 30, 2016 and 2015, and for the fiscal years ended June 30, 2016 and 2015, have been audited by EKS&H LLLP, an independent registered public accounting firm, and are incorporated herein by reference in reliance on
its report dated September 13, 2016, and upon its authority as an expert in accounting and auditing.